Quality Of Service (Qos); Call Admission Control (Cac) - Cisco 8821 Manual

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Quality of Service (QoS)

Quality of Service enables queuing to ensure high priority for voice traffic.
To enable proper queuing for voice and call control traffic use the following guidelines.
•
Ensure that WMM is enabled on the access point.
•
Create a QoS policy on the access point giving priority to voice and call control traffic.
Traffic Type
Voice
Call Control
•
Be sure that voice and call control packets have the proper QoS markings and other protocols are not using the same
QoS markings.
•
Enable Differentiated Services Code Point (DSCP) preservation on the Cisco IOS switch.
For more information about TCP and UDP ports used by the Cisco Wireless IP Phone 8821 and 8821-EX and the Cisco Unified
Communications Manager, refer to the Cisco Unified Communications Manager TCP and UDP Port Usage document at this
URL:
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/port/10_0_1/CUCM_BK_T537717B_00_tcp-port-usage-guide-
100.html

Call Admission Control (CAC)

Call Admission Control can be enabled on the access point.
•
Enable Call Admission Control (CAC) / 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 Wireless IP Phone 8821 and 8821-EX will specify 12 Mbps for the PHY rate to be used for TSPEC.
Pre-Call Admission Control
If Call Admission Control is enabled on the access point, the Cisco Wireless IP Phone 8821 and 8821-EX will send an Add
Traffic Stream (ADDTS) to the access point to request bandwidth in order to place or receive a call.
Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
Yes
No
DSCP 802.1p
EF (46) 5 6
CS3 (24) 3 4
No Yes
No No
WMM UP Port Range
UDP 16384 - 32767
TCP 5060 - 5061
Yes
No
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