Phone Does Not Register With Cisco Unified Communications Manager; Phone Cannot Connect To Tftp Server - Cisco 8821 Administration Manual

Phone Does Not Register with Cisco Unified Communications Manager

Phone Does Not Register with Cisco Unified Communications Manager
If a phone proceeds past the first stage (authenticating with access point) and continues to cycle through the
messages displaying on the phone screen, the phone is not starting up properly. The phone cannot successfully
start up until it connects to the LAN and registers with a Cisco Unified Communications Manager server.
The following sections can assist you in determining the reason that the phone is unable to start up properly.
Phone Cannot Connect to TFTP Server or to Cisco Unified Communications Manager
Problem
If the network is down between the phone and either the TFTP server or Cisco Unified Communications
Manager, the phone cannot start up properly.
Solution
Ensure that the network is currently running.

Phone Cannot Connect to TFTP Server

Problem
The TFTP server setting on the phone is incorrect.
Cause
The phone 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 Communications Manager1 (CM1) shows as TFTP_AS_CM if the phone
has not registered with Cisco Unified Communications Manager before.
If the phone has previously registered with Cisco Unified Communications Manager, the Cisco Unified
Note
Communications Manager 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 Unified
Communications Manager service is not running on the TFTP server, or if SRST is not running on the gateway,
the phone may continually cycle while attempting to contact the identified TFTP server.
The phone 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.
Solution
If you have assigned a static IP address to the phone, you must manually enter the TFTP server address. See
Manually Set Up the Phone Network from the Settings Menu , on page
If you are using DHCP, the phone obtains the address for the TFTP server from the DHCP server. Check the
IP address configured in the DHCP server.
Cisco Wireless IP Phone 8821 and 8821-EX Administration Guide for Cisco Unified Communications Manager
116
Troubleshooting
65.