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Cisco Unified Wireless IP Phone 7921G Administration Guide for Cisco Unified Communications Manager Release 7.0
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Chapter 3 Setting Up the Cisco Unified Wireless IP Phone 7921G
Understanding the Phone Startup Process
Standby Mode
The phone goes into standby mode two seconds after a scan is complete. The phone will awaken from
standby mode in response to these events:
•
Pressing keys on the keypad
•
Roaming between APs
•
Power cycling the phone
•
Losing network connectivity
•
Losing RF connectivity
•
Transmitting scheduled CDP or keep-alive packets.
The standard battery provides up to 150 hours of standby time and the extended battery provides up to
200 hours of standby time.
Related Topics
•
Understanding the Phone Startup Process, page 3-18
•
Resolving Startup and Connectivity Problems, page 10-1
Understanding the Phone Startup Process
When connecting to the wireless VoIP network, the Cisco Unified Wireless IP Phone 7921G goes
through a standard startup process, as described in
Table 3-6
.
Note
Depending on your specific network configuration, some of the steps might not occur on your unified
IP phone.
Table 3-6
Cisco Unified Wireless IP Phone Startup Process
Step
Description
Related Topics
1. Powering on the phone
The Cisco Unified Wireless IP Phone 7921G has
non-volatile Flash memory in which it stores firmware
images and user-defined preferences. At startup, the phone
runs a bootstrap loader that loads a phone image stored in
Flash memory. The phone uses this image to initialize its
software and hardware.
Providing Power to the Phone,
page 3-7
Resolving Startup and
Connectivity Problems,
page 10-1
2. Scanning for an access
point
The Cisco Unified Wireless IP Phone 7921G scans the RF
coverage area with its radio. The phone searches its
network profiles and scans for access points that have a
matching SSID and authentication type. The phone
associates with the access point with the highest RSSI that
matches with its network profile.
Interacting with Cisco Unified
Wireless APs, page 2-9
Resolving Startup and
Connectivity Problems,
page 10-1
