C.5 Definition of media feature tag g.3gpp.srvcc-alerting

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

Media feature-tag name: g.3gpp.srvcc-alerting

ASN.1 Identifier: 1.3.6.1.8.2.13

Summary of the media feature indicated by this tag: This media feature-tag when used in a Contact header field of a SIP request or a SIP response indicates that the functional entity sending the SIP message supports the PS to CS SRVCC for calls in alerting phase, i.e. for calls with early dialog.

Values appropriate for use with this feature-tag: Boolean

The feature-tag is intended primarily for use in the following applications, protocols, services, or negotiation mechanisms: This feature-tag is most useful in a communications application, for describing the capabilities of a device, such as a phone or PDA.

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

Related standards or documents: 3GPP TS 24.237: "IP Multimedia Subsystem (IMS) Service Continuity; Stage 3"

Security Considerations: Security considerations for this media feature-tag are discussed in subclause 12.1 of IETF RFC 3840 [53].