I have the same problem. I great IP phone who doesn't support SIP protocol.
Can you please tell me if you have find a SIP firmware and if yes when can I donwload it ?
Thank you so much for your help
Have a nice day
In SIP firmware for Cisco Phone CP-7921G
(Thu 15 of Apr, 2010 (15:29 UTC))quikpt
Cisco has no official SIP firmware for the wifi phone 7921. However, I know that a few companies already developed custom cisco phone firmware to deliver special needs, being aware that cisco will not support it.
Does anybody knows any company or individual that is willing to develop ,as a service, a sip firmware for 7921, which the only features required would be accept and make calls?