Cisco 8821

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
35
LEAP Proxy RADIUS
Server
Yes
No
Yes
Yes
All Token Servers
No
No
No
No
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
DSCP
802.1p
WMM UP
Port Range
Voice
EF (46)
5
6
UDP 16384 - 32767
Call Control
CS3 (24)
3
4
TCP 5060 - 5061
• 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.