What does Call Admission Control require the client to send in order to reserve the bandwidth?

SIP flow information describes the signaling and call setup parameters, but it does not directly specify the media's bandwidth requirements for resource reservation within a CAC system.

Wi-Fi Multimedia (WMM) is a QoS standard for Wi-Fi networks that prioritizes traffic, but it is a network capability, not information sent by the client to reserve bandwidth for CAC.

Call Admission Control (CAC) mechanisms rely on clients providing a traffic specification (TSpec) to describe their bandwidth and QoS requirements, allowing the network to explicitly reserve resources before a call is admitted.

VoIP media session awareness is a general understanding of the traffic type, not a specific protocol message or data structure sent by the client to request and reserve bandwidth.