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  ITU-T A.5 justification information for referenced document ETSI TS 124 610 V10.2.0 (2013-10) in draft Q.3640
1. Clear description of the referenced document:
Name: ETSI TS 124 610 V10.2.0 (2013-10)
Title: Digital cellular telecommunications system (Phase 2+);Universal Mobile Telecommunications System (UMTS);LTE;Communication HOLD (HOLD) using IP Multimedia (IM) Core Network (CN) subsystem;
2. Status of approval:
ETSI TS 124.610 was published in 2013-10. It is an ETSI standard document.
3. Justification for the specific reference:
It is used as a reference in the Recommendation ITU-T Q.30xx_VoLTE_Interconnection_FW
4. Current information, if any, about IPR issues:
Information about IPR could be available for ETSI members and non-members and found in SR 000 314: „Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available free of charge from the ETSI Secretariat and on the ETSI web site http://www.etsi.org/ipr.
5. Other useful information describing the "Quality" of the document:
ETSI TS 124.610 was published in 2013-10. It is an ETSI standard document.
6. The degree of stability or maturity of the document:
ETSI TS 124.610 was published in 2013-10. It is an ETSI standard document.
7. Relationship with other existing or emerging documents:
[1] 3GPP TS 24.229: "INTERNET PROTOCOL (IP) MULTIMEDIA CALL CONTROL PROTOCOL BASED ON SESSION INITIATION PROTOCOL (SIP) AND SESSION DESCRIPTION PROTOCOL (SDP); STAGE 3".
8. Any explicit references within that referenced document should also be listed:
[1] 3GPP TS 24.229: "Internet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3"./
[2] Void./
[3] Void/
[4] IETF RFC 3264 (2002): "An Offer/Answer Model with the Session Description Protocol (SDP)"./
[5] 3GPP TS 22.173: "IP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service and supplementary services; Stage 1"./
[6] 3GPP TS 24.628: "Common Basic Communication procedures; Protocol specification"./
[7] ETSI TS 183 010 V1.2.2: "Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); NGN Signalling Control Protocol; Communication HOLD (HOLD) PSTN/ISDN simulation services; Protocol specification"./
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):
If the Study Group decides to make the reference to the ETSI TS 124.610, the reference should always be made by ETSI number.
Note: This form is based on Recommendation ITU-T A.5