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Thursday, December 3, 2009

CUCM 7.1(3) TFTP Auth Fail. 7941G stuck in firmware upgrade loop.

We have a brand new 7941G phone that we attempted to change from SCCP to SIP for testing. We placed the contents of the firmware zip file into a tftp directory and pointed DHCP option 66 to that tftp server and started the upgrade process. The phone grabbed the term41.default.loads file several times over several reboots but now it appears to be stuck in a loop. It no longer tries to pull any files from the tftp server, it just sits with the upgrading screen and then occasionally reboots itself.

Debugging Steps
  1. Please confirm the Firmware rev loaded on the TFTP server. You cannot go straight to 8.5.3. You will need to have 8.5.2, 8.5.2 SR1 and 8.5.3 all on the TFTP server, with the loads file from 8.5.2 having overwritten the others on the TFTP server.
  2. If your phone displays the Cisco Splash screen, but with a circle with a dot in it bottom left hand side, and after a short while come up Auth Fail? If so, that is the phone being unable to find a suitable firmware version.
  3. Download and put the 8.5.2 & 8.5.2SR1 firmwares on your TFTP server ( copying 8.5.2 last, so the correct term41.default.loads file is present.
  4. Remove the voice vlan then configure the access vlan with the voice vlan number. The same voice vlan number used as the access vlan
  5. IP addressing assigned by DHCP should have been the same.
  6. Once the firmware loads correctly, the access vlan and voice vlan can be configured to the original settings.
  7. The phone should then be able to upgrade to 8.5.2, then 8.5.2SR1 and finally to 8.5.3.

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