What must a client send for Call Admission Control to reserve bandwidth?
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Correct answer: traffic specification.
Why this is the answer
For Call Admission Control (CAC) to reserve bandwidth, a client must send a traffic specification (TSPEC). The TSPEC defines the characteristics of the traffic flow, including bandwidth requirements, burst size, and other quality of service (QoS) parameters. This information allows the network to determine if sufficient resources are available to admit the call and maintain the desired QoS. SIP flow information is part of session setup but doesn't directly reserve bandwidth. Wi-Fi Multimedia (WMM) is a QoS mechanism for Wi-Fi networks, not a client-sent reservation message. VoIP media session awareness is a general concept, not a specific message sent by the client for bandwidth reservation.
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