6.4 Implicit transmit media request

24.2813GPPMission Critical Video (MCVideo) signalling controlProtocol specificationRelease 16TS

An initial SIP INVITE request fulfilling the following criteria shall be regarded by the MCVideo server as an implicit transmit media request by the originating MCVideo client when the MCVideo client:

1) initiates an MCVideo session that is not used for a remotely initiated ambient viewing call; and

2) includes the "mc_implicit_request" ‘fmtp’ attribute in the associated UDP stream for the transmission control in the SDP offer/answer as specified in 3GPP TS 24.581 [5] clause 12.

An initial SIP INVITE request fulfilling the following criteria shall be regarded by the MCVideo server as an implicit request to grant permission to send media to the terminating MCVideo client when the originating MCVideo client:

1) initiates an MCVideo session that is a remotely initiated ambient viewing call; and

2) includes the "mc_implicit_request" ‘fmtp’ attribute in the associated UDP stream for the transmission control in the SDP offer/answer as specified in 3GPP TS 24.581 [5] clause 12.

A SIP re-INVITE request fulfilling the following criteria shall be regarded by the MCVideo server as an implicit transmit media request when the MCVideo client:

1) performs an upgrade of:

a) an MCVideo group call to an emergency MCVideo group call;

b) an MCVideo group call to an imminent peril MCVideo group call; and

2) includes the "mc_implicit_request" ‘fmtp’ attribute in the associated UDP stream for the transmission control in the SDP offer/answer as specified in 3GPP TS 24.581 [5] clause 12.

In all other cases the SIP (re-)INVITE request shall be regarded as received without an implicit transmit media request.