Question: During MCPTT session initialization, what determines if a SIP INVITE request is regarded as an implicit floor request?
Option 1: The type of media (audio/video) being requested in the SIP INVITE.
Option 2: The presence of a specific header indicating floor control in the SIP INVITE.
Option 3: The outcome of negotiations during call establishment regarding implicit floor requests for new vs. rejoining calls.
Option 4: The priority level negotiated for Floor Request messages between the IWF and the floor participant.
Explanation: According to MCPTT procedures, whether a SIP INVITE is considered an implicit floor request depends on the negotiations that occurred during call setup, specifically distinguishing between new calls and rejoining ongoing group calls. This nuance highlights the importance of call context in managing floor control and media transmission efficiently in MCPTT sessions.