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The DTIM period is a tradeoff between battery life and multicast performance.
Broadcast and multicast traffic will be queued until the DTIM period when there are power save enabled clients associated to
the access point, so DTIM will determine how quickly these packets can be delivered to the client. If using multicast
applications, a shorter DTIM period can be used.
Scan Modes
When using only one access point, select Single Access Point Mode on the phone to reduce scanning and optimize battery life
for phones that do not roam.
When using multiple access points where roaming is required, "Single AP Mode" should not be enabled. Instead use the auto
(default) or continuous scan mode, which will allow for seamless roaming.
Continuous scan mode can be optionally enabled to allow for better location tracking.
Quality of Service (QoS)
Quality of Service enables queuing to ensure high priority for voice traffic. To implement appropriate queuing for voice traffic,
use the following suggestions:
Ensure that WMM is enabled on the access point.
•
Create a QoS policy on the access point giving priority to voice (RTP) and call control (SCCP) traffic and apply that
•
profile to the desired interfaces.
Traffic Type
Voice (RTP)
Call Control (SCCP)
Be sure that RTP packets have the proper QoS markings and other protocols are not using the same QoS markings.
•
Select the "Platinum" QoS profile for the voice wireless LAN when using Cisco Unified Wireless LAN Controller
•
technology and set the 802.1p tag to "6".
Enable Differentiated Services Code Point (DSCP) preservation on the Cisco IOS switch and/or use a QoS policy to set
•
DSCP to EF for RTP traffic (UDP port range 16384-32767) on the Cisco IOS router.
For more information about TCP and UDP ports used by the Cisco Unified Wireless IP Phone 7925G Series 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/en/US/docs/voice_ip_comm/cucm/port/7_1_2/CCM_7.1.2PortList.pdf
Configuring QoS in Cisco Unified Communications Manager
The SCCP DSCP values are configured in the Cisco Unified Communications Manager enterprise parameters. Cisco Unified
Communications Manager uses the default value of CS3 to have devices set the DSCP marking for SCCP packets as shown in
the Enterprise Parameters Configuration page.
Cisco Unified Wireless IP Phone 7925G Series Deployment Guide
DSCP
802.1p
EF (46)
5
CS3 (24)
3
WMM UP
6
4
24
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