C.5A Definition of feature-capability indicator g.3gpp.srvcc-alerting

24.2373GPPIP Multimedia (IM) Core Network (CN) subsystem IP Multimedia Subsystem (IMS) service continuityRelease 17Stage 3TS

Feature-capability indicator name: g.3gpp.srvcc-alerting

Summary of the feature indicated by this feature-capability indicator:

This feature-capability indicator when used in a Feature-Caps header field of a SIP request or a SIP response indicates that:

1. the functional entity including the feature-capability indicator in the SIP message supports the PS to CS SRVCC for calls in alerting phase; and

2. all entities of which the functional entity including the feature-capability indicator in the SIP message is aware of being requested to support the feature do support the PS to CS SRVCC for calls in alerting phase.

Feature-capability indicator specification reference:

3GPP TS 24.237, http://www.3gpp.org/ftp/Specs/archive/24_series/24.237/

Values appropriate for use with this feature-capability indicator: none

Examples of typical use: Indicating that a network entity supports the PS to CS SRVCC for calls in alerting phase.

Security Considerations: Security considerations for this feature-capability indicator are discussed in clause 9 of IETF RFC 6809 [60].