Point IP Phone to different CUCM Cluster without factory defaulting

[Reuben Gehman]

We are in the process of breaking our contact center off our corporate CUCM cluster and moving it to it's own new cluster. I need to register the existing phones with the new cluster and I'm looking for method that is quicker then factory defaulting the phone and having it reinstall the firmware. Is anyone aware of a way to wipe the phone's config but not the firmware?

[Dennis Mink]

what part of the config exactly are you looking at wiping?  I  mean as soon as an existing phone receives a new TFTP server through option 150, it will pull its config of that new TFTP server and will adhere to that new cluster's required firmware version.

[Reuben Gehman]

Even if I change the TFTP server the CM list still remains and the phone registers with the old cluster. The only way I've been able to register phones with the new cluster is to factory default the phone. This works, but it takes a while because it downloads and installs the firmware all over again. I would like to avoid that if there are no  major drawbacks.

[Nadeem Ahmed · Accepted solution]

also did you try to erase the CTL and ITL after pointing to TFTP server.

Br,
Nadeem Ahmed

[Reuben Gehman]

I did not, but now that I've done that the phone has registered with the new cluster. Thank you very much, this is exactly what I was looking for.

[Jaime Valencia]

In anything above CUCM 8.x there's ITL involved, you cannot simply move endpoints between cluster without previous config.

http://docwiki.cisco.com/wiki/Endpoints_FAQ#How_can_I_bulk_remove_ITL_.2F_CTL_files_from_phones.3F.3F

Doing a factory reset works, because it clears CTL and ITL.