S4-260031 - AI Summary

LS on initiation of new work item Q.IMS-INT-RS “IMS interconnection restoration architecture and procedures”

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LS on Initiation of New Work Item Q.IMS-INT-RS "IMS Interconnection Restoration Architecture and Procedures"

Document Overview

This is a Liaison Statement (LS) from ITU-T Study Group 11 to 3GPP (for information) announcing the initiation of a new work item Q.IMS-INT-RS on "IMS interconnection restoration architecture and procedures" during the ITU-T SG11 meeting in Geneva, November 17-26, 2025.

Main Technical Contribution

New Work Item Initiation

ITU-T SG11 has initiated work on Q.IMS-INT-RS, which specifies restoration architecture and procedures based on a shared backup interconnection point to enhance service resilience in IMS interconnection scenarios.

Scope of Q.IMS-INT-RS

The draft Recommendation covers the following technical areas:

1. Restoration Architecture

  • Defines the restoration architecture for IMS interconnection
  • Focuses on shared backup interconnection point mechanisms

2. Service Interruption Conditions

  • Specifies conditions under which IMS interconnection service interruptions occur
  • Identifies scenarios requiring restoration procedures

3. Restoration Signaling Procedures

  • Details the signaling procedures for IMS interconnection restoration
  • Defines protocol interactions for failover and recovery

4. Interface Descriptions

  • Provides interface descriptions specific to IMS interconnection restoration
  • Defines reference points and protocols for restoration mechanisms

Collaboration Request

ITU-T SG11 is seeking collaboration with 3GPP on this subject matter, given the relevance to IMS interconnection which is a key area of 3GPP specifications.

Reference Documents

The baseline text of Q.IMS-INT-RS is available in SG11-TD657/GEN (attached to the LS).

Document Information
TDoc:
S4-260031
Source:
ITU-T Study Group 11
Type:
LS in
For:
Information
Original Document:
View on 3GPP
Title: LS on initiation of new work item Q.IMS-INT-RS “IMS interconnection restoration architecture and procedures”
Agenda item: 5.3
Agenda item description: Other groups
Doc type: LS in
For action: Information
Original LS: SG11-LS80
To: 3GPP
Contact: Andrijana Brekalo
Uploaded: 2026-01-21T16:01:08.570000
Contact ID: 91743
TDoc Status: noted
Reservation date: 21/01/2026 15:57:15
Agenda item sort order: 8