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182 025
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9 Management
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The provisions of the present document are contained in ETSI TS 124 525 [30]. ETSI ETSI TS 182 025 V3.4.0 (2015-10) 8 Annex A (informative): Example signalling flows of business trunking and roaming arrangements See ETSI TS 124 525 [30], Annex A. ETSI ETSI TS 182 025 V3.4.0 (2015-10) 9 Annex B (informative): Service Level Agreement (SLA) considerations See ETSI TS 124 525 [30], Annex B. ETSI ETSI TS 182 025 V3.4.0 (2015-10) 10 Annex C (informative): Topics for business trunking for a future release See ETSI TS 124 525 [30], Annex C. ETSI ETSI TS 182 025 V3.4.0 (2015-10) 11 Annex D (informative): Bibliography See ETSI TS 124 525 [30], Annex D. ETSI ETSI TS 182 025 V3.4.0 (2015-10) 12 Annex E (informative): Change history Date WG Doc. CR Rev CAT Title / Comment Current Version New Version 06/11/09 22bTD145r1 001 r1 F Creation of Release 3 2.1.1 3.0.0 16/12/09 23WTD199r1 002 B Registration_Free_Business_Trunking 3.0.0 3.0.1 CRs 001 and 002 TB approved at TISPAN#23 3.0.1 3.1.0 05/02/10 TISPAN03 (10)0058 003 F Misc. Corrections 3.1.0 3.1.1 05/02/10 TISPAN03 (10)0041r1 004 F Spec(T) ref correction 3.1.0 3.1.1 Update of Change history table and WI reference 3.1.1 3.1.2 15/04/10 TISPAN03 (10)0110r3 005 B Peering_Based_Business_Trunking 3.1.2 3.1.3 CRs 003 to 005 TB approved at TISPAN#24 3.1.3 3.2.0 03/06/10 TISPAN03 (10)0168r1 006 F Wildcarded PUI 3.2.0 3.2.1 03/06/10 TISPAN03 (10)0170r2 007 F Miscellaneous Improvements 3.2.0 3.2.1 03/06/10 TISPAN03 (10)0 008 C Clarification of peering-based business trunking flows 3.2.0 3.2.1 03/06/10 TISPAN03 (10)0178r1 009 F Update figures 3.2.0 3.2.1 03/06/10 TISPAN03 (10)0169r3 010 F Alignment with 3GPP TS 24.229 Rel-9 3.2.0 3.2.1 16/09/10 TISPAN03 (10)0228r1 011 F Correction – Invalid Reference 3.2.1 3.2.2 16/09/10 TISPAN03 (10)0229r1 012 F Correction: name Private-Network-Indicator 3.2.1 3.2.2 16/09/10 TISPAN03 (10)0231r1 013 F Correction - textual error for Peering Based Business Trunking 3.2.1 3.2.2 16/09/10 TISPAN03 (10)0233r1 014 C Annex Topics for BT for study in this or future releases 3.2.1 3.2.2 16/09/10 TISPAN03 (10)0223r4 015 C WI2080_Peering_based_business_trunking_applications 3.2.1 3.2.2 27/10/10 TISPAN03 (10)249r1) 016 F Clarification and corrections about aliases 3.2.2 3.2.3 27/10/10 TISPAN03 (10)250r1) 017 F P-CSCF redundancy 3.2.2 3.2.3 27/10/10 TISPAN03 (10)251r1) 018 F Initial registration 3.2.2 3.2.3 27/10/10 TISPAN03 (10)267r1) 019 F Proposed global changes and specific changes to clause 5 3.2.2 3.2.3 27/10/10 TISPAN03 (10)268r3) 020 F Proposed changes to clause 6 3.2.2 3.2.3 08/12/10 TISPAN03 (10)290r3 021 C Loose Route and Outbound 3.2.3 3.2.4 08/12/10 TISPAN03 (10)284r3 022 F Changes to clause 6 and annex B 3.2.3 3.2.4 08/12/10 TISPAN03 (10)294r1 023 D Replace Editor's note in 6.2.4.1 3.2.3 3.2.4 08/12/10 TISPAN03 (10)296 024 D Final Clean-up 3.2.3 3.2.4 Publication 3.2.4 3.3.1 10/12/14 NTECH(14)0 9_013 025 D Replacement of the text wih references to TS 124 525 3.3.1 3.4.0 ETSI ETSI TS 182 025 V3.4.0 (2015-10) 13 History Document history V2.1.1 September 2008 Publication V3.3.1 March 2011 Publication V3.4.0 October 2015 Publication
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4eb76d4af1f075a22d2d05b1e088c831
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182 024
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1 Scope
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The present document describes the architecture and functionality required to support enterprise and corporate services as IMS applications hosted in the NGN operator's network on behalf of an enterprise (Hosted Enterprise Services). The present document also specifies the protocol requirements for the UE to attach to the NGN (in particular the IMS) and also any protocol requirements related to application servers provided in support of hosted enterprise services. The structure of the present document reflects the historical structure of previous versions of it. All references to ETSI TS 124 524 [25] are intended to be to the entire contents of the referenced document, which now forms the contents of the present document, and not to any part which might be implied by any headings within the present document.
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182 024
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2 References
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4eb76d4af1f075a22d2d05b1e088c831
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182 024
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2.1 Normative references
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References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http://docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. The following referenced documents are necessary for the application of the present document. [1] Void. [2] Void. [3] Void. [4] Void. [5] Void. [6] Void. [7] Void. [8] Void. [9] Void. [10] Void. [11] Void. [12] Void. [13] Void. [14] Void. [15] Void. [16] Void. [17] Void. [18] Void. ETSI ETSI TS 182 024 V3.0.0 (2015-10) 6 [19] Void. [20] Void. [21] Void. [22] Void. [23] Void . [24] Void. [25] ETSI TS 124 524: "Universal Mobile Telecommunications System (UMTS); LTE; Hosted enterprise services; Architecture, functional description and signalling (3GPP TS 24.524)".
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4eb76d4af1f075a22d2d05b1e088c831
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182 024
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2.2 Informative references
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References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. Not applicable.
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4eb76d4af1f075a22d2d05b1e088c831
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182 024
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3 Definitions and abbreviations
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4eb76d4af1f075a22d2d05b1e088c831
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182 024
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3.1 Definitions
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For the purposes of the present document, the terms and definitions given in ETSI TS 124 524 [25] apply.
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4eb76d4af1f075a22d2d05b1e088c831
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182 024
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3.2 Abbreviations
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For the purposes of the present document, the abbreviations given in ETSI TS 124 524 [25] apply.
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4eb76d4af1f075a22d2d05b1e088c831
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182 024
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4 Overview
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The provisions of the present document are contained in ETSI TS 124 524 [25].
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4eb76d4af1f075a22d2d05b1e088c831
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182 024
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5 Architecture
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The provisions of the present document are contained in ETSI TS 124 524 [25].
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4eb76d4af1f075a22d2d05b1e088c831
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182 024
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6 Procedures
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The provisions of the present document are contained in ETSI TS 124 524 [25].
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4eb76d4af1f075a22d2d05b1e088c831
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182 024
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7 Use of Transport Functions
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The provisions of the present document are contained in ETSI TS 124 524 [25]. ETSI ETSI TS 182 024 V3.0.0 (2015-10) 7
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182 024
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8 Security issues
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The provisions of the present document are contained in ETSI TS 124 524 [25].
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4eb76d4af1f075a22d2d05b1e088c831
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182 024
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9 Management Issues
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The provisions of the present document are contained in ETSI TS 124 524 [25]. ETSI ETSI TS 182 024 V3.0.0 (2015-10) 8 Annex A (informative): Processing of dial strings by the UE See Annex A of ETSI TS 124 524 [25]. ETSI ETSI TS 182 024 V3.0.0 (2015-10) 9 Annex B (informative): Scenarios for HES extension to CS users See Annex B of ETSI TS 124 524 [25]. ETSI ETSI TS 182 024 V3.0.0 (2015-10) 10 Annex C (informative): Change history Date WG Doc. CR Rev CAT Title / Comment Current Version New Version 3/09/2015 NTECH(15) 12_003 001 D Alignment with 3GPP TS 24.524 2.1.1 3.0.0 ETSI ETSI TS 182 024 V3.0.0 (2015-10) 11 History Document history V2.1.1 August 2008 Publication V3.0.0 October 2015 Publication
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6085f156875695399abe5c27f75ee0b8
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181 005
|
1 Scope
|
The present document specifies network requirements in terms of service-related capabilities for TISPAN NGN. The present document places requirements for all TISPAN NGN Release 1 subsystems. The present document provides generic requirements for services and interoperability in TISPAN NGN in terms of the capabilities for a network or networks. Requirements on service-related subsystems provide sufficient detail for architecture, networking requirements and protocols to be specified. Requirements on service independent subsystems are contained within the service-related subsystem requirements. Specific service requirements may be contained in other documents, as identified in the present document, and by other documents referencing the present document. The present document does not define services, only capabilities and requirements. The present document does not place requirements on terminals or other customer-owned equipment. The present document specifies the service-related requirements that are used to determine the network architecture, requirements and control protocols for a network interface to a customer environment. NOTE: The present document uses the term "NGN" only in the context of TISPAN.
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181 005
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2 References
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References are either specific (identified by date of publication and/or edition number or version number) or non-specific. • For a specific reference, subsequent revisions do not apply. • Non-specific reference may be made only to a complete document or a part thereof and only in the following cases: - if it is accepted that it will be possible to use all future changes of the referenced document for the purposes of the referring document; - for informative references. Referenced documents which are not found to be publicly available in the expected location might be found at http://docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term validity.
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181 005
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2.1 Normative references
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The following referenced documents are indispensable for the application of the present document. For dated references, only the edition cited applies. For non-specific references, the latest edition of the referenced document (including any amendments) applies. [1] ETSI TR 180 000: "Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); NGN Terminology". [2] ETSI TS 122 340: "Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia Subsystem (IMS) messaging; Stage 1 (3GPP TS 22.340)". [3] ETSI TS 102 424: "Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); Requirements of the NGN network to support Emergency Communication from Citizen to Authority". ETSI ETSI TS 181 005 V1.2.1 (2009-12) 7 [4] ETSI TS 188 003 (V1.y.z): "Telecommunications and Internet Converged Services and Protocols for Advanced Networking (TISPAN); OSS requirements; OSS definition of requirements and priorities for further network management specifications for NGN". NOTE: The latest version in the V1.y.z series applies. [5] ETSI TS 122 228: "Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Service requirements for the Internet Protocol (IP) multimedia core network subsystem (IMS); Stage 1 (3GPP TS 22.228 version 7.3.0 Release 7)". [6] ETSI TS 122 495: "Universal Mobile Telecommunications System (UMTS); TISPAN;Services and Capabilities Requirements (3GPP TS 22.495 version 7.0.0 Release 7)". [7] ETSI TS 187 005 (V1.y.z): "Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); NGN Release 2 Lawful Interception; Stage 1 and Stage 2 definition". NOTE: The latest version in the V1.y.z series applies. [8] IETF RFC 2486: "The Network Access Identifier".
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181 005
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2.2 Informative references
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The following referenced documents are not essential to the use of the present document but they assist the user with regard to a particular subject area. For non-specific references, the latest version of the referenced document (including any amendments) applies. Not applicable.
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6085f156875695399abe5c27f75ee0b8
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181 005
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3 Definitions and abbreviations
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6085f156875695399abe5c27f75ee0b8
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181 005
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3.1 Definitions
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For the purposes of the present document, the terms and definitions given in TS 122 228 [5], TR 180 000 [1] and the following apply: IP multimedia application: See TS 122 228 [5]. IP multimedia service: See TS 122 228 [5]. IP multimedia session: See TS 122 228 [5]. IP Multimedia Core Network Subsystem (IM CN Subsystem): See TS 122 228 [5]. nomadism: See TR 180 000 [1]. portability: See TR 180 000 [1].
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181 005
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3.2 Abbreviations
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For the purposes of the present document, the following abbreviations apply: ACR Anonymous Communications Rejection service requirements AMR Adaptive Multi-Rate AN Access Network CN Core Network CS Circuit Switched DSL Digital Subscriber Line IM IP Multimedia IMS IP Multimedia Subsystem ETSI ETSI TS 181 005 V1.2.1 (2009-12) 8 IP Internet Protocol IPCAN IP-Connectivity Access Network IPv4 Internet Protocol version 4 IPv6 Internet Protocol version 6 ISDN Integrated Services Digital Network MCID Malicious Communication Identity service requirements NAI Network Access Identifier NAT Network Address Translation NGN Next Generation Network PLMN Public Land Mobile Network PSTN Public Switched Telephone Network QoS Quality of Service SLA Service Level Agreements TDM Time Division Multiplexing URI Uniform Resource Identifier
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181 005
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4 Capabilities for the support IP Multimedia Services
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This clause covers the requirements of the IP Multimedia services supported by the NGN.
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181 005
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4.1 Business models
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As specified in TS 122 495 [6].
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6085f156875695399abe5c27f75ee0b8
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181 005
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4.2 Service requirements
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As specified TS 122 495 [6].
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6085f156875695399abe5c27f75ee0b8
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181 005
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4.2.1 General services requirements
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As specified in TS 122 495 [6].
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181 005
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4.2.2 Handling of sessions
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As specified in TS 122 495 [6].
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181 005
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4.2.3 PSTN/ISDN Simulation Service
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As specified in TS 122 495 [6].
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181 005
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4.2.4 IMS messaging
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As specified in TS 122 495 [6].
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181 005
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4.2.5 Presence Service
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As specified in TS 122 495 [6].
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181 005
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4.2.6 Location Service
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As specified in TS 122 495 [6].
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181 005
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4.2.7 VideoTelephony Service
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As specified in TS 122 495 [6]. ETSI ETSI TS 181 005 V1.2.1 (2009-12) 9
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6085f156875695399abe5c27f75ee0b8
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181 005
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4.3 Mobility
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As specified in TS 122 495 [6].
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6085f156875695399abe5c27f75ee0b8
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181 005
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4.4 Number, naming and addressing
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As specified in TS 122 495 [6].
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181 005
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4.5 Terminal requirements
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The present document does not specify terminal requirements. However, NGN terminals (not precluding network adaptors) that comply with the NGN IMS UNI interface offered by the network, shall be supported by the NGN. The NGN IMS UNI interface is not required to support 3GPP mobile terminals in Release 1. It is a service provider option to support a 3GPP IPCAN for a user to access the NGN IMS. The NGN IMS shall support 3GPP mobile terminals connected via the 3GPP IPCAN. Terminal developers guidelines are provided in annex B.
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181 005
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4.6 Regulatory service requirements
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As specified in TS 122 495 [6].
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181 005
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4.7 Access network requirements
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Any access to the NGN core shall provide IP connectivity, i.e. allow transport of IP packets between end user equipment and the NGN core. Solutions for access to the NGN core shall support the assignment of IP addresses to the end user equipment by the access network. These addresses may not be routable in the public Internet. Solutions for access to the NGN core shall not require changes to existing access technology infrastructure. All solutions for access to the NGN core shall support the presence of NAT and firewalls in the access network environment. Impacts on access networks shall be minimized. An NGN deployment shall not inhibit user access to the Internet and other IP networks through existing mechanisms, e.g. ISP offering of internet access to DSL users.
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181 005
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4.8 Customer Networks
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6085f156875695399abe5c27f75ee0b8
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181 005
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4.8.1 General
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Access from a customer network to the NGN core shall provide IP connectivity, i.e. allow for transport of IP packets from the end user equipment. Solutions for access from a customer network to the NGN shall be able to cope with the assignment of IP addresses to the end user equipment by the customer network. These addresses may not be routable in the public Internet. Solutions for access from a customer network to the NGN shall not require technological changes to existing customer network technologies. Solutions for access from a customer network to the NGN shall have minimal impact on existing customer network deployments. ETSI ETSI TS 181 005 V1.2.1 (2009-12) 10
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181 005
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4.8.2 Home and Small Office Networks
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Solutions for access from a Home and Small Office network to the NGN shall be able to cope with NAT and firewalls in the home/small office environment. Solutions for access from a Home and Small Office network to the NGN shall support the following configurations: • Direct connectivity and interaction between the individual terminals and the NGN. • Indirect connectivity and interaction between the individual terminals and the NGN (e.g. via IP PBXs).
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181 005
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4.8.3 Corporate Networks
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Solutions for access from a corporate network to the NGN shall be able to cope with NAT and firewalls in the corporate environment. Solutions for access from a Corporate network to the NGN shall support the following configurations: • Direct connectivity and interaction between the individual terminals and the NGN (e.g. to support Ipcentrex configurations). • Indirect connectivity and interaction between the individual terminals and the NGN (e.g. via IP PBXs).
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6085f156875695399abe5c27f75ee0b8
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181 005
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4.9 Interworking
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As specified in TS 122 495 [6].
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181 005
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4.10 Quality of Service (QoS)
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The NGN shall support the following: • A wide range of QoS-enabled services. • Dynamic negotiation of QoS parameters between service and access providers based on an SLA. • Terminals that are not capable to indicate QoS requirements as part of the service request. Terminals that are capable shall also be supported. • QoS provisioning within the access segment. QoS in the core transport network is considered to be achieved by other means that are out of the scope of NGN Release 1 (e.g. Overprovision). • The provisioning of QoS for application traffic where upstream and downstream flows have specific QoS requirements. • An architecture that supports bandwidth reservation. • QoS mechanisms to allow efficient use of access resource.
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181 005
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4.11 Security Requirements
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As specified in TS 122 495 [6].
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181 005
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4.11.1 General
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As specified in TS 122 495 [6] except the following requirements: • The Access Network shall provide access connectivity to a user entitled to use the resources of the Access Network. ETSI ETSI TS 181 005 V1.2.1 (2009-12) 11 • The NGN shall support independent verification by IMS and Access Network of the previous two requirements.
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181 005
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4.12 Charging and Accounting
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As specified in TS 122 495 [6].
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181 005
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5 PSTN/ISDN Emulation Service
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6085f156875695399abe5c27f75ee0b8
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181 005
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5.1 Business Models
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The business model envisaged for PSTN/ISDN Emulation Service is the replacement (in whole or part) of an existing PSTN/ISDN network based on TDM with an Emulation based on IP technology. An alternative business model is the provision of PSTN/ISDN service over connections derived from broadband service, which compete with the existing or Emulated PSTN. Both business models may co-exist in the same market place. A NGN service provider shall be capable of connecting to other service provider via: • an interconnect model where bi-lateral Service Level Agreements are established between two service providers; • an interconnect model where intermediate network(s) can provide interconnect on behalf of multiple service providers (and may be based on a single Service Level Agreement between the SP and their intermediate service provider). A single NGN service provider shall be able to choose to support either of the interconnect models, or both of the interconnect models simultaneously.
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181 005
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5.2 Service Requirements
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The NGN shall support PSTN /ISDN emulation that provides the user with an identical experience to that of the existing PSTN/ISDN. The NGN shall support the ability for a service operator to emulate one or more of their PSTN/ISDN services. The NGN shall support service capability definitions inherited from existing PSTN/ISDN specification. The service descriptions of the existing services for any particular network are outside the scope of the present document. It is an objective that the user shall be unaware of a change from legacy PSTN/ISDN to PSTN/ISDN emulation for those services that are emulated. For each emulated service, the service capability definitions are inherited from existing PSTN/ISDN specifications. Specific service requirements related to PSTN/ISDN Emulation are described in the following clauses.
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181 005
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5.3 Mobility
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There is no requirement to support mobility or a nomadic capability for PSTN/ISDN Emulation. There are no additional mobility requirements. This does not prevent the existence of user nomadism where it is implicit in the chosen business model nor does it require that nomadism be actively prevented. ETSI ETSI TS 181 005 V1.2.1 (2009-12) 12
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181 005
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5.4 Number, naming and addressing
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The users of PSTN/ISDN Emulation will be allocated numbers (or number ranges) in the appropriate E.164 number space allocated by the national numbering authority. The nature of this E.164 number will vary from operator to operator and from country to country. The design shall permit the use of both geographical and non-geographical E.164 numbers. There is no requirement to support the use of non-E.164 names within PSTN/ISDN Emulation but the use of non-E.164 names is not precluded. PSTN/ISDN emulation places no new requirements to support number portability.
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181 005
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5.5 Terminal requirements
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The NGN shall support terminals that use existing PSTN/ISDN interfaces. Whilst the NGN has no role in standardizing terminals it is recognized that a key aspect of the PSTN/ISDN emulation subsystem is the ability to enable PSTN/ISDN replacement whilst maintaining all the existing services in the network. NOTE: More advanced terminals may use the PSTN/ISDN emulation subsystem to provide identical PSTN/ISDN services to the user. Such advanced terminals may or may not be able to access additional services not related to PSTN/ISDN emulation but the functions of such terminals are not subject to standardization within the Release 1 of NGN.
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181 005
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5.6 Regulatory service requirements
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181 005
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5.6.1 Lawful Intercept service requirements
|
All implementations of PSTN/ISDN Emulation shall provide the ability to provide Lawful Interception in accordance with national requirements. Where possible the packet interception handover interfaces should be made available to authorities to avoid the ability of targets to maintain covert channels not monitored by TDM handover interfaces. Packet handover is most important for derived service where the packet stream is not under direct control of the provider of the Electronic Communication Network. The capabilities to support Lawful Intercept for Emulation shall be as described in TS 187 005 [7].
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181 005
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5.6.2 Emergency service requirements
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The capabilities to support the Emergency Service shall be as described in TS 102 424 [3].
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6085f156875695399abe5c27f75ee0b8
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181 005
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5.6.3 Malicious Communication Identity service requirements (MCID)
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MCID is a service which is expected to be provided in the context of the European Telecoms Privacy Directive or equivalent regulations in other jurisdictions. The service is required for all speech calls irrespective of which network originated the call. It is normally provided following a request from the customer concerned and may be subject to authorization.
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6085f156875695399abe5c27f75ee0b8
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181 005
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5.6.4 Anonymous Communications Rejection service requirements (ACR)
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The service capability definition for this service is inherited from existing PSTN/ISDN specifications and no new requirements are identified. ETSI ETSI TS 181 005 V1.2.1 (2009-12) 13
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6085f156875695399abe5c27f75ee0b8
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181 005
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5.7 Access Networks
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6085f156875695399abe5c27f75ee0b8
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181 005
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5.7.1 Wireline Access
|
The deployment of an NGN supporting PSTN/ISDN emulation may support existing access methods and access network technologies. The PSTN/ISDN User-Network Interface shall not be affected.
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6085f156875695399abe5c27f75ee0b8
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181 005
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5.8 Customer Networks
| |
6085f156875695399abe5c27f75ee0b8
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181 005
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5.8.1 Home and Small Office Networks
|
In the case of PSTN/ISDN Emulation used to replace an existing analogue or TDM network these are handled in the same way as the network which is being replaced or substituted. Where the business model involves derived voice the customer will present lines to either an Access Gateway or a Residential Gateway as appropriate. In some cases there will be a terminal that offers service in an alternative manner but that is not within the scope of the present document. A Residential Gateway may be situated within a Customer Access Gateway or on the customer network side of it. The Customer Access Gateway may use any suitable access technology. In addition where existing Primary Rate ISDN or equivalent services are provided the PSTN/ISDN Emulation may support them. The actual signalling systems and methods of presentation supported are a national matter, supported by the list of designated standards published by the European Commission.
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6085f156875695399abe5c27f75ee0b8
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181 005
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5.8.2 Corporate Networks
|
Within the context of the PSTN/ISDN Emulation Corporate Networks may continue to be supported. The actual signalling systems and methods of presentation supported are a national matter supported by the list of designated standards published by the European Commission. This support may extend to the provision of VPN services using signalling systems and methods of presentation which are provided on a national basis and those that rely on European Standards.
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6085f156875695399abe5c27f75ee0b8
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181 005
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5.9 Interworking
| |
6085f156875695399abe5c27f75ee0b8
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181 005
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5.9.1 Interworking with Legacy PSTN/ISDN
|
PSTN/ISDN emulation shall provide interfaces to PSTN/ISDN networks. The NGN shall support the ability for the interconnection between two PSTN/ISDN and/or emulation networks to remain unchanged from the legacy case. PSTN/ISDN Emulation shall provide a high level of interoperability with the services in the PSTN/ISDN being emulated. The degree to which service interoperability is provided is a matter for operators of Public Electronic Communications Networks and, in some cases, national regulators.
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6085f156875695399abe5c27f75ee0b8
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181 005
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5.9.2 Interworking with PSTN/ISDN Emulation
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PSTN/ISDN Emulation shall provide a high level of interoperability with the services in other Emulated PSTN/ISDN networks. The degree to which service interoperability is provided is a matter for operators of Public Electronic Communications Networks and, in some cases, national regulators. ETSI ETSI TS 181 005 V1.2.1 (2009-12) 14
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6085f156875695399abe5c27f75ee0b8
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181 005
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5.9.3 Interworking with PLMN
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6085f156875695399abe5c27f75ee0b8
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181 005
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5.9.3.1 Interworking with IMS based PLMN
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Inter-working with the part of a PLMN that is based on an IMS shall be as described for inter-working with a IMS network.
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6085f156875695399abe5c27f75ee0b8
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181 005
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5.9.3.2 Interworking with PLMN - CS Domain
|
Inter-working with the circuit switched part of a PLMN shall be as described above for Inter-working with a PSTN/ISDN network.
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6085f156875695399abe5c27f75ee0b8
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181 005
|
5.9.4 Interworking with Packet Cable network
|
Inter-working with the Packet Cable network shall be as described for Inter-working with a legacy PSTN/ISDN network or as described for Inter-working with an emulated PSTN/ISDN network. The choice of method is at the discretion of the operators concerned or as directed by a regulatory authority.
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6085f156875695399abe5c27f75ee0b8
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181 005
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5.9.5 Interworking with IMS network
|
Refer to clause 4.9.2.
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6085f156875695399abe5c27f75ee0b8
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181 005
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5.9.6 Interworking with other networks
|
Inter-working with non-IMS and non-TDM network is the same as for inter-working with: i) A TDM based PSTN/ISDN as described above; or ii) Another PSTN/ISDN Emulation as described above. The choice of method is at the discretion of the operators concerned or as directed by a regulatory authority.
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6085f156875695399abe5c27f75ee0b8
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181 005
|
5.10 Quality of Service (QoS)
|
The PSTN/ISDN Emulation shall provide QoS transmission facilities to enable the same end-to-end performance requirements of the PSTN to be met. This includes any reservation of bit rate through the Access transport and also includes any transcoding facilities that may be needed.
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6085f156875695399abe5c27f75ee0b8
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181 005
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5.11 Security requirements
|
A PSTN/ISDN Emulation shall meet the security requirements placed on a national PSTN/ISDN network. Where appropriate, requirements and mechanisms may vary to take account of the underlying NGN and IP technology.
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6085f156875695399abe5c27f75ee0b8
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181 005
|
5.12 Charging and accounting
|
The requirements and mechanisms for charging are a national matter. ETSI ETSI TS 181 005 V1.2.1 (2009-12) 15
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6085f156875695399abe5c27f75ee0b8
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181 005
|
6 Codecs services
|
The following requirements apply to audio and video codecs support within the network.
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6085f156875695399abe5c27f75ee0b8
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181 005
|
6.1 General
|
It is the responsibility of entities at the rim of the NGN (e.g. NGN-TE) and Network equipment originating and terminating the NGN IP media flows, to negotiate and select a common codec for each "end-to-end" media session. Therefore the NGN shall allow end-to-end negotiation of any codec between NGN entities (terminal, network elements).
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6085f156875695399abe5c27f75ee0b8
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181 005
|
6.2 Audio Codec
|
In order to enable interworking between the NGN and other networks (including the PSTN, mobile networks and other NGNs) the NGN must be capable of receiving and presenting G.711 coded speech when interconnected with another network. When a packetization size is not selected by codec negotiation between terminals and/or network elements or agreed by bilateral arrangement, a speech packetization size of 10 ms samples should be used for G.711 coded speech; this is recommended as an optimum value balancing end-to-end delay with network utilization. It is recognized that there may be network constraints which require that a higher value is agreed by bilateral arrangement; in such cases a value of 20 ms is recommended. NOTE: Where a packetization size is selected by codec negotiation between terminals and/or network elements the present document places no requirements on the value to be selected. The above does not put any requirement about the codecs to be supported by terminals nor does it mandate that NGN networks shall support audio transcoding between any arbitrary codec to G.711. In addition, support for the following audio codecs is recommended: • AMR: in order to support 3GPP terminals and to facilitate the interwork with 3GPP network. • G.729A: in order to facilitate the interwork with existing VoIP networks and support existing VoIP terminals. In order to provide voice service with a superior quality experience by the end-user it is recommended to provide also a Wide-band codec. Audio transcoding may be performed to provide end-to-end service interoperability, but should be avoided wherever possible.
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6085f156875695399abe5c27f75ee0b8
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181 005
|
6.3 Video Codec
|
In order to enable the interworking for video communication services between an NGN Network and other Networks the support of the H.263 profile 0 and H.264 baseline profile codecs is recommended. The above does not put any requirement about the codecs to be supported by terminals nor does it mandate that NGN networks shall support video transcoding between any arbitrary codec and H.263 or H.264.
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6085f156875695399abe5c27f75ee0b8
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181 005
|
7 Network Attachment Requirements
|
The user network profile contains user access authentication data and information related to the required network access configuration. The NGN shall support the re-configuration of services available to the user when the user is nomadic and accesses their services from a location other than the subscribed-to location. Services may be dependent on any or all of: the user device, the access network and arrangements (e.g. roaming agreements) between the Application provider and the access network provider. The access network shall allocate resources in accordance to the services to be provided. ETSI ETSI TS 181 005 V1.2.1 (2009-12) 16 In access roaming scenarios, those access networks that provide access to NGN services shall be able to authenticate/authorize access to the network based on information retrieved from the access networks where the user is subscribed to. To guarantee the interoperability of roaming services, the NGN access network attachment procedures shall support access network authentication based on a standardized method for identifying users at access network level (e.g. the NAI mechanism specified in RFC 2486 [8]). NAI based user authentication shall be supported.
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6085f156875695399abe5c27f75ee0b8
|
181 005
|
8 CPE Configuration
|
The NGN shall be able to provide configuration parameters and obtain operational status of the CPE. This includes the ability to provide SW upgrade, service configuration, collect operational status.
|
6085f156875695399abe5c27f75ee0b8
|
181 005
|
9 Network Management
|
Network Management requirements shall be as described in TS 188 003 [4].
|
6085f156875695399abe5c27f75ee0b8
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181 005
|
10 Control of Processing Overload
|
The NGN shall have mechanisms available to control overload that: 1) automatically maximize effective throughput (i.e. admitted service requests/sec) at an overloaded resource. 2) achieve this throughout the duration of an overload event, and irrespective of the overloaded resource's capacity or of the number of sources of overload; 3) are configurable by the service provider so that, under processing overload, a high proportion of response times at overloaded resources are low enough so as not to cause customers to prematurely abandon service requests; 4) should be possible to be applied within a service provider's NGN, and between different service providers' NGNs; 5) should be possible to be applied within an NGN subsystem (e.g. IMS, PSTN/ISDN emulation) and between different NGN subsystems. NOTE: As a general rule, an NGN's call, session and command processing resources can experience prolonged processing overload under the appropriate circumstances (e.g. partial, or full, server failure, high rates of incoming service requests). Consequently, it needs to be equipped with some form of overload detection and control (including expansive controls such as load balancing and resource replication), in order to keep response times just low enough under such processing overload to preclude customers abandoning their service requests prematurely.
|
6085f156875695399abe5c27f75ee0b8
|
181 005
|
11 IP Addressing
|
The Operator of an NGN infrastructure may base the implementation on IPv4 only, IPv6 only or both. The choice is an operator option. NOTE 1: It should be recognized that a mixture of IPv4 and IPv6 within a single operator domain can cause problems for service delivery. NGN operators may support customer equipment using IPv4 only, IPv6 only or both at an IP-based User-Network Interface. The choice is an operator option. NOTE 2: It is assumed that IPv6 based customer equipment can also support IPv4 at the User-Network Interface. ETSI ETSI TS 181 005 V1.2.1 (2009-12) 17 Annex A (informative): Basic communication cases for IMS networks As specified in TS 122 495 [6]. ETSI ETSI TS 181 005 V1.2.1 (2009-12) 18 Annex B (informative): Guidance for terminal implementation As specified in TS 122 495 [6]. ETSI ETSI TS 181 005 V1.2.1 (2009-12) 19 Annex C (informative): Bibliography • ETSI TS 181 002: "Requirements for Multimedia Telephony with PSTN/ISDN Simulation Services". • ETSI TS 181 001: "NGN Videotelephony; Stage 1 Service Description". • ETSI TS 122 141 (V7.0.0): "Universal Mobile Telecommunications System (UMTS); Presence service; Stage 1 (3GPP TS 22.141 version 7.0.0 Release 7)". • IETF RFC 3966: "The tel URI for Telephone Numbers". • IETF RFC 3261: "SIP: Session Initiation Protocol". • ETSI TS 187 001: "Telecommunications and Internet Converged Services and Protocols for Advanced Networking (TISPAN); NGN SECurity (SEC); Requirements". • ETSI TS 122 115: "Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Service aspects; Charging and billing (3GPP TS 22.115)". ETSI ETSI TS 181 005 V1.2.1 (2009-12) 20 Annex D (normative): Rel-7 parts of Common IMS Void. ETSI ETSI TS 181 005 V1.2.1 (2009-12) 21 Annex E (informative): Change history Date WG Doc. CR Rev CAT Title / Comment Current Version New Version 02-07-08 17bTD029r2 001 F TS 181 005 split 1.1.1 1.1.2 27-01-09 19tTD067r1 002 F Common IMS references 1.1.2 1.1.3 CRs 001 and 002 TB approved 1.1.3 1.2.0 21bTD21r1 003 F Revision of notes that contain normative text 1.2.0 1.2.1 CR 003 TB approved and publication 1.2.1 ETSI ETSI TS 181 005 V1.2.1 (2009-12) 22 History Document history V1.1.1 March 2006 Publication V2.4.1 November 2007 Publication V2.5.1 December 2009 Publication V3.3.1 December 2009 Publication V1.2.1 December 2009 Publication
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ae3dfca740c8c62772d38184c6500f19
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181 002
|
1 Scope
|
The present document defines the requirements for multimedia telephony services which may be supported by a TISPAN NGN. These requirements form the basis for the definition of network capabilities. An important aspect of the Multimedia Telephony with PSTN/ISDN Simulation service is to provide PSTN/ISDN like services. Nevertheless the requirements are independent of the media that is used during the communication. The present document covers part of the transition from PSTN/ISDN to an NGN. Interconnection between the existing networks and a TISPAN NGN is also covered. The present document only provides requirements for services using IMS. Services provided by a TISPAN NGN to support legacy terminals and interfaces (PSTN/ISDN emulation) are defined in existing PSTN/ISDN documents. Requirements for PSTN/ISDN Emulation are out of the scope of the present document and are described in other documents. New NGN services are out of the scope of the present document and are described in other documents. The applicability of PSTN/ISDN simulation services to services other than Multimedia Telephony (e.g. instant messaging) is not defined. Some PSTN/ISDN simulation services (for example communication waiting) are clearly not applicable to some real-time communication services. The requirements in the present document are described from the user point of view to assist in the transition of phone services to IP multimedia services with a similar behaviour. The requirements do not take into account capabilities of existing protocols. The evolution or modifications to these protocols are beyond the scope of the present document.
|
ae3dfca740c8c62772d38184c6500f19
|
181 002
|
2 References
|
References are either specific (identified by date of publication and/or edition number or version number) or non-specific. • For a specific reference, subsequent revisions do not apply. • Non-specific reference may be made only to a complete document or a part thereof and only in the following cases: - if it is accepted that it will be possible to use all future changes of the referenced document for the purposes of the referring document; - for informative references. Referenced documents which are not found to be publicly available in the expected location might be found at http://docbox.etsi.org/Reference. For online referenced documents, information sufficient to identify and locate the source shall be provided. Preferably, the primary source of the referenced document should be cited, in order to ensure traceability. Furthermore, the reference should, as far as possible, remain valid for the expected life of the document. The reference shall include the method of access to the referenced document and the full network address, with the same punctuation and use of upper case and lower case letters. NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term validity.
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ae3dfca740c8c62772d38184c6500f19
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181 002
|
2.1 Normative references
|
The following referenced documents are indispensable for the application of the present document. For dated references, only the edition cited applies. For non-specific references, the latest edition of the referenced document (including any amendments) applies. [1] ETSI TS 181 005: "Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); Services and Capabilities Requirements". ETSI ETSI TS 181 002 V2.2.5 (2007-11) 9 [2] ITU-T Recommendation I.210: "Principles of telecommunication services supported by an ISDN and the means to describe them". [3] ETSI TS 102 424: "Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); Requirements of the NGN network to support Emergency Communication from Citizen to Authority".
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ae3dfca740c8c62772d38184c6500f19
|
181 002
|
2.2 Informative references
|
[4] ETSI TR 180 000: "Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); NGN Terminology". [5] ITU-T Recommendation I.112 (1993): "Integrated services digital network ISDN; Vocabulary of terms for ISDNs)". [6] ITU-T Recommendation Q.9: "Vocabulary of switching and signalling terms". [7] IETF RFC 2806: "URLs for Telephone Calls". [8] IETF RFC 2396: "Uniform Resource Identifiers (URI): Generic Syntax". [9] ITU-T Recommendation E.164: "The international public telecommunication numbering plan". [10] ETSI ETS 300 095 (edition 1): "Integrated Services Digital Network (ISDN);Connected Line Identification Restriction (COLR) supplementary service; Service description". [11] ETSI EN 301 798 (V1.1.1): "Services and Protocols for Advanced Networks (SPAN); Anonymous Call Rejection (ACR) Supplementary Service; Service description". [12] ETSI ETS 300 200: "Integrated Services Digital Network (ISDN); Call Forwarding Unconditional (CFU) supplementary service; Service description". [13] ETSI EN 300 199 (V1.2.1): "Integrated Services Digital Network (ISDN); Call Forwarding Busy (CFB) supplementary service; Service description". [14] ETSI EN 300 201 (V1.2.1): "Integrated Services Digital Network (ISDN); Call Forwarding No Reply (CFNR) supplementary service; Service description". [15] ETSI ETS 300 202: "Integrated Services Digital Network (ISDN); Call Deflection (CD) supplementary service; Service description". [16] ETSI ETS 300 056: "Integrated Services Digital Network (ISDN); Call Waiting (CW) supplementary service; Service description". [17] ETSI ETS 300 139: "Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; Service description". [18] ETSI EN 301 082 (V2.1.1): "Integrated Services Digital Network (ISDN); Outgoing Call Barring-Fixed (OCB-F) supplementary service; Service description". [19] ETSI EN 301 084 (V2.1.1): "Integrated Services Digital Network (ISDN); Outgoing Call Barring-User Controlled (OCB-UC) supplementary service; Service description". [20] ETSI TS 122 228 (V6.7.0): "Digital cellular telecommunications system (Phase 2+);Universal Mobile Telecommunications System (UMTS);Service requirements for the Internet Protocol (IP) multimedia core network subsystem (IMS);Stage 1 (3GPP TS 22.228 Release 6)". [21] ETSI EN 300 357 (V1.2.1): "Integrated Services Digital Network (ISDN); Completion of Calls to Busy Subscriber (CCBS) supplementary service; Service description". [22] ETSI EN 300 650 (V1.2.1): "Integrated Services Digital Network (ISDN); Message Waiting Indication (MWI) supplementary service; Service description". [23] ETSI ETS 300 183: "Integrated Services Digital Network (ISDN); Conference call, add-on (CONF) supplementary service; Service description". ETSI ETSI TS 181 002 V2.2.5 (2007-11) 10 [24] ETSI ETS 300 164: "Integrated Services Digital Network (ISDN); Meet-Me Conference (MMC) supplementary service; Service description". [25] ETSI ETS 300 178: "Integrated Services Digital Network (ISDN); Advice of Charge: charging information at call set-up time (AOC-S) supplementary service; Service description". [26] ETSI ETS 300 179: "Integrated Services Digital Network (ISDN); Advice of Charge: charging information during the call (AOC-D) supplementary service; Service description". [27] ETSI ETS 300 180: "Integrated Services Digital Network (ISDN); Advice of Charge: charging information at the end of the call (AOC-E) supplementary service; Service description". [28] ETSI ETS 300 367: "Integrated Services Digital Network (ISDN);Explicit Call Transfer (ECT) supplementary service; Service description". [29] ITU-T Recommendation I.256.3 (1992): "Integrated Services Digital Network (ISDN); general structure and service capabilities; Reverse Charging". [30] ETSI ETS 300 136 (1992): "Integrated Services Digital Network (ISDN); Closed User Group (CUG) supplementary service; Service description". [31] ETSI ETS 300 186 (Edition 1): "Integrated Services Digital Network (ISDN);Three-Party (3PTY) supplementary service; Service description".
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ae3dfca740c8c62772d38184c6500f19
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181 002
|
3 Definitions and abbreviations
| |
ae3dfca740c8c62772d38184c6500f19
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181 002
|
3.1 Definitions
|
For the purposes of the present document, the following terms and definitions given in TR 180 000 [4] and the following apply: call: See ITU-T Recommendation Q.9 [6], definition 2201. call establishment; connection establishment: See ITU-T Recommendation Q.9 [6] , definition 2207. callback: See TS 102 424 [3]. connection: See ITU-T Recommendation Q.9 [6] , definition 0011. NOTE: In the present document, the term is taken to include a bearer and its associated control signalling. communication: transfer of information between two or more users, entities, processes or nodes according to some agreed conventions NOTE: See ITU-T Recommendation I.112 [5] modified. emergency call: See TS 102 424 [3]. identity information: includes all the information (e.g. RFC 2806 [7]/RFC 2396 [8]/E.164 [9]) identifying a user, including asserted public identities (network generated) and/or unasserted (user generated) public identities incoming (communication): communication incoming to the user side of the interface interface: See ITU-T Recommendation Q.9 [6] , definition 4001. IP multimedia application: See TR 180 000 [4]. originating party: See TR 180 000 [4]. outgoing (communication): communication outgoing from the user side of the interface PSAP: See TS 102 424 [3]. PSTN/ISDN Emulation: See TR 180 000 [4]. ETSI ETSI TS 181 002 V2.2.5 (2007-11) 11 PSTN/ISDN Simulation: See TR 180 000 [4]. terminating party: See TR 180 000 [4].
|
ae3dfca740c8c62772d38184c6500f19
|
181 002
|
3.2 Abbreviations
|
For the purposes of the present document, the following abbreviations apply: 3PTY Three Party ACR Anonymous Communication Rejection AOC-D Advice Of Charge - During the communication AOC-E Advice Of Charge - at the End of the communication AOC-S Advice Of Charge - charging information at communication Set-up time CB Communication session Barring CCBS Completion of Communication sessions to Busy Subscriber CD Communication Deflection CDIV Communication DIVersion CDIVN CDIV Notification CFB Communication Forwarding Busy CFNL Communication Forwarding on Not Logged-in CFNR Communication Forwarding No Reply CFNRc Communication Forwarding on Subscriber Not Reachable CFU Communication Forwarding Unconditional COLP COnnected Line identification Presentation COLR COnnected Line identification Restriction CONF CONFerence CS Circuit Switched CUG Closed User Group CW Communication Waiting ECT Explicit Communication Transfer HOLD Communication HOLD ICB Incoming Communications Barring IMS IP Multimedia Subsystem IP Internet Protocol ISDN Integrated Services Digital Network MCID Malicious Communication IDentification MWI Message Waiting Indication NGN Next Generation Network OCB Outgoing Communications Barring OIP Originating Identification Presentation OIR Originating Identification Restriction PLMN Public Land Mobile Network PSAP Public Safety Answer Point PSTN Public Switch Telephone Network TIP Terminating Identification Presentation TIR Terminating Identification Restriction
|
ae3dfca740c8c62772d38184c6500f19
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181 002
|
4 Service Description
|
From the human user point of view, Multimedia Telephony with PSTN/ISDN simulation services, provides a suite of service that are, in most aspects, the same as those already existing in the PSTN/ISDN. The services described are not limited to voice media as in PSTN/ISDN, but generally applicable regardless of the media used (voice, video, etc.). In addition to the capabilities to establish a bi-directional point-to-point communication between two parties, a selected number of PSTN/ISDN Simulation services, corresponding to perceived popular PSTN/ISDN supplementary services are included in the present document. PSTN/ISDN simulation services are described from a user's perspective and are similar or almost identical to the corresponding supplementary service in PSTN/ISDN. ETSI ETSI TS 181 002 V2.2.5 (2007-11) 12 However, from a functionality distribution perspective, the present document places no particular requirements on the functionality distribution between network and terminals. Further, it is perceived that the need to preserve the split of functionality provided for supplementary services in an ISDN or PSTN is not a requirement in an NGN.
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ae3dfca740c8c62772d38184c6500f19
|
181 002
|
5 Service requirements
| |
ae3dfca740c8c62772d38184c6500f19
|
181 002
|
5.1 Mandatory requirements
| |
ae3dfca740c8c62772d38184c6500f19
|
181 002
|
5.1.1 General
|
Communication sessions in an NGN may provide the ability for users to invoke multimedia telephony applications to send and receive multimedia (including voice and data) communications. The requirements, in the context of the present document, refers to the Multimedia Telephony with PSTN/ISDN Simulation Services as a complete set. If the complete set is not offered, then for reasons of compatibility, the mandatory services shall be provided as part of any multimedia telephony with PSTN/ISDN simulation service offering. There is no mandatory requirement to offer Multimedia Telephony with PSTN/ISDN Simulation Services in a particular network deployment. The multimedia telephony services shall support interworking with existing fixed and mobile voice and IP data networks, including PSTN, ISDN, Mobile and Internet. Multimedia telephony communications between NGN IMS users and users in PSTN/PLMN-CS networks shall be supported. When a multimedia telephony session originates or terminates in a circuit-switched network (telephony call), the CS telephony network user should not detect a difference from that of a communication between two CS telephony network users in terms of aspects such as the delay to set-up communications and the total permissible delay in transporting speech between the end users. The multimedia telephony with PSTN/ISDN Simulation service does not necessarily have to support all services offered by the CS telephony network. Services not interoperated across the different network types shall be declined in a graceful and consistent manner.
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ae3dfca740c8c62772d38184c6500f19
|
181 002
|
5.1.2 Logged-in
|
The term "Logged-in" corresponds to an identity registered in the network as being able to receive and initiate communications. A user is considered "not-logged in" when the identity is not currently registered in the network. Registration and authentication procedures shall be provided as described in TS 181 005 [1].
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ae3dfca740c8c62772d38184c6500f19
|
181 002
|
5.1.3 IP multimedia application subscription
|
There is no requirement to support standardized subscription mechanisms for multimedia telephony and PSTN/ISDN simulation applications. Multimedia telephony and PSTN/ISDN Simulation applications may require to be provisioned and configured by users and operators. There are no requirements on the network capabilities to support provisioning and configuration for specific IP multimedia applications. NOTE: The standardized service capabilities, personalized Internet web pages and evolving IP mechanisms may be used to allow user (self) provisioning, configuration and enabling of IP multimedia applications.
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ae3dfca740c8c62772d38184c6500f19
|
181 002
|
5.1.4 Capability negotiation
|
Capability negotiation is part of a basic multimedia communications service and shall be provided as described in TS 181 005 [1] (clause 5.2.5). ETSI ETSI TS 181 002 V2.2.5 (2007-11) 13
|
ae3dfca740c8c62772d38184c6500f19
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181 002
|
5.1.5 Invoking PSTN/ISDN Simulation services
|
The user shall be able to invoke one or more PSTN/ISDN simulation services as part of session establishment, and during an established session.
|
ae3dfca740c8c62772d38184c6500f19
|
181 002
|
5.1.5.1 Identification of entities
|
The requirements for identification of entities shall be provided as described in TS 181 005 [1].
|
ae3dfca740c8c62772d38184c6500f19
|
181 002
|
5.1.5.2 Emergency communications
|
Emergency communications requirements shall be provided as described in TS 181 005 [1].
|
ae3dfca740c8c62772d38184c6500f19
|
181 002
|
5.1.6 Handling of an incoming session (by the terminating party)
|
The specific requirements for the multimedia telephony with PSTN/ISDN simulation service shall be provided as described in clause 5.2.1.1 of TS 181 005 [1].
|
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