Cisco 7920 Administration Guide - Page 186
Checking Network Connectivity, Verifying TFTP Server Settings, Device >, Phone > Find
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Resolving Startup and Connectivity Problems Chapter 9 Troubleshooting the Cisco Wireless IP Phone 7920 To verify that the phone is in the Cisco CallManager database, choose Device > Phone > Find from Cisco CallManager Administration to search for the phone based on its MAC Address. (To determine the MAC address of a phone, see the "Viewing the Media Access Control Address" section on page 6-5.) If the phone is already in the Cisco CallManager database, its configuration file may be damaged. See the "Creating a New Configuration File" section on page 9-10 for assistance. Checking Network Connectivity If the network is down between the access point and the TFTP server or Cisco CallManager, the phone cannot start up properly. Ensure that IP connectivity exists between the WLAN and the Cisco CallManager and TFTP servers. Verifying TFTP Server Settings The Cisco Wireless IP Phone 7920 uses the TFTP server setting to identify the primary TFTP server to use. If the TFTP server does not respond to the request, then the CallManager1 (CM1) shows as TFTP_AS_CM if the phone has not registered with Cisco CallManager before. Note If the phone has previously registered with Cisco CallManager, the Cisco CallManager list information is cached in memory. If TFTP fails, you must power cycle the phone to connect to the TFTP server. The phone tries to create a TCP connection to the TFTP IP address and then to the gateway. If Cisco CallManager service is not running on the TFTP server, or if SRST is not running on the gateway, the Cisco Wireless IP Phone may continually cycle while attempting to contact the identified TFTP server. The Cisco Wireless IP Phone 7920 does not cache the IP information passed from the DHCP server, so the TFTP request must be sent and responded to every time the phone power cycles. If you have assigned a static IP address to the phone, you must manually enter this setting. See the "Configuring Static Settings" section on page 5-6. Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 4.0 and 4.1 9-6 OL-7104-01