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Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 3.3 or Later
OL-3930-02
Chapter 2 Preparing to Install the Cisco Wireless IP Phone 7920 on Your Wireless Network
Interactions with Components in the VoIP Network
access point coverage is still adequate for optimal voice communications. See the
“Performing a Site Survey Verification” section on page 6-15 for more
information.
Related Topics
• Overview of a Wireless LAN, page 1-4
• Wireless Network and Access Point Configuration, page 3-3
Associating to an Access Point
At startup, the Cisco Wireless IP Phone 7920 uses its radio to scan for access
points with SSIDs and encryption types that it recognizes. The phone lists eligible
access point targets and uses the following two variables to determine the best
access point with which to associate.
Received Signal Strength Indicator (RSSI)—The phone uses this value to
determine the signal strength of available access points within the RF coverage
area. The phone attempts to associate with the access point with the highest RSSI
value.
QoS Basis Service Set (QBSS)—The access point sends this beacon information
element (IE) to communicate the access point channel utilization to the
Cisco Wireless IP Phone. The phone uses the QBSS value to determine if channel
utilization is high and the access point is unable to effectively handle more traffic.
The Cisco Wireless IP Phone associates with the access point with the highest
RSSI and lowest QBSS values that have matching SSID and encryption types.
Related Topics
• Roaming in a Wireless Network, page 2-4
• Overview of a Wireless LAN, page 1-4
• Wireless Network and Access Point Configuration, page 3-3