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Chapter 3 Setting Up the Cisco Wireless IP Phone 7920
Before You Begin
3-4
Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 3.3 or Later
OL-3930-02
When configuring a wireless voice LAN, Cisco recommends that APs must run
Cisco IOS version 12.2(15)JA or later. The recommended APs that run IOS
include the following:
• Aironet 350 series
• Aironet 1100 series
• Aironet 1200 series
Table 3-2 explains and provides references for many of the configuration
activities for the Cisco Aironet Access Point.
Table 3-2 Cisco Aironet AP Configuration Tasks
Activity Explanation Reference
Check that the
Cisco IOS version is the
recommended version
Under System Software, check for
Cisco IOS version 12.2(15)JA or later.
Refer to the Wireless 7920 Design
and Deployment Guide
Interacting with the Cisco Aironet
Access Point, page 2-2
Configure an auxiliary
VLAN for voice
To isolate voice traffic and enable QoS,
you need a separate voice VLAN on the
AP and network switch.
Refer to the Wireless 7920 Design
and Deployment Guide
Voice Quality in a Wireless
Network, page 2-5
Configure Service Set
Identifier (SSID) for
each VLAN
Identifier for a set of wireless devices
to communicate with each other.
Several APs can have the same SSID to
support a group of wireless phones.
Refer to the Wireless 7920 Design
and Deployment Guide
Interacting with the Cisco Aironet
Access Point, page 2-2
Configure QoS settings
for VLANs
Create a QoS policy for the Voice
VLAN and assign a higher CoS to voice
traffic. Enable the QoS element for
Wireless Phones to provide channel
utilization information to phones.
Refer to the Wireless 7920 Design
and Deployment Guide
Voice Quality in a Wireless
Network, page 2-5
Enable ARP Caching Enable this option to ensure two-way
audio. The AP has ARP caching
disabled by default.
Refer to the Wireless 7920 Design
and Deployment Guide