I have 22 7941G phones working with SIP41.9-3-1SR4-1S and have no issues other than a few specfic keys like CFwdAll that do not function properly. As I understand it, some keys like the CFwdAll keys need to have Asterisk patched to work anyway.
You MUST use “USECALLMANAGER” in your settings instead of the server IP address for version 9 and up to work.
i got the same problem with my Cisco 7941G-phone. With Firmware 8xx i had no problems. Since i upgraded to SIP41.9-2-3S i got the error on the asterisk-cli when i try to press the button CFwdAll followed by my mobile-nr:
[Jun 10 14:15:48] NOTICE: chan_sip.c:22622 handle_request_invite: Call from ‘XXXXXX’ (192.168.X.XXX:50950) to extension ‘x–serviceuri-cfwdall-017XXXXXXXXX’ rejected because extension not found in context ‘Context of the phones’.
I tried to update SIP41.9-3-1SR2-1S without problems, but that didn’t solve the problem.
What kind of patch you where talking about? Is it easy to install on my pbx? I’ve got Asterisk 188.8.131.52~dfsg-1ubuntu1