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  ITU-T A.5 justification information for referenced document ETSI TS 123 216 V14.0.0 (2017-05) in draft Q.3644
1. Clear description of the referenced document:
Name: ETSI TS 123 216 V14.0.0 (2017-05)
Title: Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Single Radio Voice Call Continuity (SRVCC); Stage 2 (3GPP TS 23.216 version 14.0.0 Release 14)
2. Status of approval:
It is approved and published by ETSI.
3. Justification for the specific reference:
It is used as a reference in the Recommendation ITU-T Q.3644 (formerly Q.VoLTE-SAO-req).
4. Current information, if any, about IPR issues:
See: https://ipr.etsi.org/.
5. Other useful information describing the "Quality" of the document:
The status of the referred ETSI document is approved standard.
6. The degree of stability or maturity of the document:
The status of the referred ETSI document is published standard.
7. Relationship with other existing or emerging documents:
None
8. Any explicit references within that referenced document should also be listed:
[1] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications"./
[2] 3GPP TS 23.401: "GPRS enhancements for E-UTRAN access"./
[3] 3GPP TS 23.402 "Architecture enhancements for non-3GPP accesses"./
[4] 3GPP2 X.S0042-0: "Voice Call Continuity between IMS and Circuit Switched System"./
[5] Void./
[6] Void./
[7] 3GPP TR 36.938: "Improved Network Controlled Mobility between E-UTRAN and 3GPP2/Mobile WiMAX Radio Technologies"./
[8] 3GPP2 A.S0008-C: "Interoperability Specification (IOS) for High Rate Packet Data (HRPD) Radio Access Network Interfaces with Session Control in the Access Network"./
[9] 3GPP TS 22.278: "Service requirements for the Evolved Packet System (EPS)"./
[10] 3GPP TS 23.060: "General Packet Radio Service (GPRS); Service description; Stage 2"./
[11] 3GPP TS 25.413: "UTRAN Iu interface Radio Access Network Application Part (RANAP) signalling"./
[12] 3GPP TS 43.129: "Packet-switched handover for GERAN A/Gb mode; Stage 2"./
[13] 3GPP TS 23.292: "IP Multimedia Subsystem (IMS) Centralized Services: Stage 2"./
[14] 3GPP TS 23.237: "IP Multimedia Subsystem (IMS) Service Continuity: Stage 2"./
[15] 3GPP TS 23.002: "Network Architecture"./
[16] 3GPP TS 36.300: "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2"./
[17] Void./
[18] 3GPP TS 23.009: "Handover procedures"./
[19] 3GPP TS 25.331: "Radio Resource Control (RRC) protocol specification"./
[20] 3GPP2 A.S0014: "Interoperability Specification (IOS) for cdma2000 Access Network Interfaces"./
[21] 3GPP TS 33.210: "3G Security; Network Domain Security; IP network layer security"./
[22] 3GPP TS 33.401: "3GPP System Architecture Evolution (SAE): Security architecture"./
[23] 3GPP TS 48.008: "Mobile Switching Centre - Base Station System (MSC-BSS) interface; Layer 3 specification"./
[24] 3GPP TS 48.018: "General Packet Radio Service (GPRS); Base Station System (BSS) - Serving GPRS Support Node (SGSN); BSS GPRS Protocol (BSSGP)"./
[25] 3GPP TS 33.102: "3G Security; Security architecture"./
[26] 3GPP TS 22.173: "IP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service and supplementary services"./
[27] 3GPP TS 23.003: "Numbering, addressing and identification"./
[28] 3GPP TS 23.167: "IP Multimedia Core Network Subsystem (IMS) emergency sessions"./
[29] 3GPP TS 23.271: "Functional stage 2 description of Location Services (LCS)"./
[30] 3GPP TS 36.413: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP)"./
[31] 3GPP TS 22.101: "Service aspects; Service principles"./
[32] 3GPP TS 23.203: "Policy and charging control architecture"./
[33] ITU-T Recommendation H.324 Annex K: "Media oriented negotiation acceleration procedure" and associated changes to Annex J"./
[34] 3GPP TS 26.111: "Codec for circuit switched multimedia telephony service; Modifications to H.324"./
[35] 3GPP TR 26.911: "Codec(s) for Circuit-Switched (CS) multimedia telephony service; Terminal implementor's guide"./
[36] 3GPP TS 36.423: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 Application Protocol (X2AP)"./
[37] 3GPP TS 29.303: "Domain Name System Procedures; Stage 3"./
[38] 3GPP TS 22.002: "Circuit Bearer Services (BS) supported by a Public Land Mobile Network (PLMN)"./
[39] 3GPP TS 22.003: "Circuit Teleservices supported by a Public Land Mobile Network (PLMN)"./
[40] 3GPP TS 23.251: "Network sharing; Architecture and functional description"./
[41] 3GPP TS 29.002: "Mobile Application Part (MAP) specification"./
[42] 3GPP TS 23.272: "Circuit Switched (CS) fallback in Evolved Packet System (EPS)"./
[43] 3GPP TS 26.267: "eCall data transfer; In-band modem solution; General description".
9. Qualification of ETSI:
ETSI is recognized under the provisions of ITU-T Recommendations A.5 and A.6. Qualifying information is on file at TSB.
10. Other (for any supplementary information):
None
Note: This form is based on Recommendation ITU-T A.5