Call Admission Control
Call Admission Control can be enabled on the access point.
• Enable Call Admission Control / Wi-Fi MultiMedia Traffic Specifications (TSPEC) for Voice
• Set the desired maximum RF bandwidth that is allocated for voice traffic (default = 75%)
• Set the bandwidth that is reserved for roaming voice clients (default = 6%)
The Cisco IP Phone 8800 Series will specify 12 Mbps for the PHY rate to be used for TSPEC.
There is no support for load-based CAC or multiple streams on the Cisco Autonomous Access Points therefore it is not
recommended to enable CAC on Cisco Autonomous Access Points.
If CAC is enabled on the Cisco Autonomous Access Point, then SRTP and barge calls will fail.
Pre-Call Admission Control
If Call Admission Control (TSPEC) is enabled on the access point, the Cisco IP Phone 8800 Series will send an Add Traffic
Stream (ADDTS) to the access point to request bandwidth in order to place or receive a call.
If the AP sends an ADDTS successful message then the Cisco IP Phone 8800 Series establishes the call.
If the access point rejects the call and the Cisco IP Phone 8800 Series has no other access point to roam to, then the phone will
display Network Busy.
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