ip phone 7962g downgrade firmware from sccp 9.3.1 to sccp 9.2.1 or to sip 9.2.1

[enrico.loiacono]

Hello! is it possible this operation? i have a router c3925 with ios c3900-universalk9-mz.SPA.152-4.m4.bin , cme 9.1.

[Amit Sharawat]

Hi,

Yes, it is possible but on a global level  with CME, please refer to the document below:

http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/admin/configuration/guide/cmeadm/cmeinstl.html#pgfId-1070512

You can downgrade it to per phone on the CUCM.

Please rate if helpful

~Amit