Cisco 7921G Administration Guide - Page 68

Understanding the Phone Startup Process Chapter 3 Setting Up the Cisco Unified Wireless IP Phone 7921G 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 1. Powering on the phone 2. Scanning for an access point Description Related Topics 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 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 3-18 Cisco Unified Wireless IP Phone 7921G Administration Guide for Cisco Unified Communications Manager Release 7.0 OL-15985-01