We've recently come across what seems to be a firmware issue on Cisco IP Phone 6941.
- Call Manager version 220.127.116.11900-4
- SCCP 69xx firmware version 18.104.22.168
- On Voice Gateway: num-exp <external number> <hunt pilot>
- Hunt Pilot rings 1 Hunt List composed by 1 broadcast Line Group, which contains 3 non-shared lines associated to 3 different Cisco 6941 IP Phones.
It has already happened twice in a week that on all of the three aforementioned Cisco 6941 IP Phones the line button keeps blinking red and an incoming call text is displayed. Non ringing occurs.
While phones are in that state they are unusable, although their status on the Call Manager admin interface shows "Registered to <Call Manager>". Furthermore, in that state there is no other way to restart/reset them than power cycling them.
Phones make use of "CP Power Cube 3" AC/DC Adaptors, since no PoE switches are available there. All other phones in the same department are 6941 and do not show any issue.
Anyone can help?
Attached is the boot log of one of those phones.