B.4 Definition of media feature tag g.3gpp.current-iut-controller

24.3373GPPIP Multimedia (IM) Core Network (CN) subsystem IP Multimedia Subsystem (IMS) inter-UE transferRelease 17Stage 3TS

Media feature-tag name: g.3gpp.current-iut-controller

ASN.1 Identifier: 1.3.6.1.8.2.11

Summary of the media feature indicated by this tag:

This media feature-tag when used in a Contact header field of SIP request or SIP response indicates that the UA is the currently active IUT controller for the collaborative session or is a controllee in the collaborative. The values of the feature tag are "active" and "passive".

Values appropriate for use with this feature-tag: string with syntax as follows:

"active" indicates that the UA is the currently active IUT controller for the collaborative session.

"passive" indicates that the UA is a controllee in the collaborative session but is willing to become an active controller for the collaborative session.

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 Inter UE control transfer operation.

Examples of typical use: Indicating that a UA wishes to relinquish control of the collaborative session and requesting a UA to become the active IUT controller for the collaborative session.

Related standards or documents: 3GPP TS 24.337: "IP Multimedia Subsystem (IMS) inter-UE transfer; Stage 3"

Security Considerations: Security considerations for this media feature-tag are discussed in subclause 14.1 of IETF RFC 3840 [24].