C.20 Definition of feature-capability indicator g.3gpp.ps2cs-drvcc-orig-pre-alerting

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

Feature-capability indicator name: g.3gpp.ps2cs-drvcc-orig-pre-alerting

The g.3gpp.ps2cs-drvcc-orig-pre-alerting feature-capability indicator shall be registered in the IANA Proxy-Feature Feature-Capability Indicator Trees registry "Global Feature-Capability Indicator Registration Tree" sub-registry.

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

This feature-capability indicator when included in a Feature-Caps header field as specified in IETF RFC 6809 [60] in a SIP INVITE request or a SIP response to the SIP INVITE request indicates support of PS to CS dual radio access transfer for originating calls in pre-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 the support of PS to CS dual radio access transfer for originating calls in pre-alerting phase in the SIP INVITE request and SIP response to the SIP INVITE request.

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