I have a IP PHone 7942G that is working fine with CME with SIP Protocol.
Now I would like to configure manually the IP Phone 7942G to register to Asterisk Server.
But I can not edit SIP Configuration in the IP Phone. I'm already typed **#, and the the password, and it showed Unlocked Message, but still block to edit SIP Configuration. Is there any other procedure to edit SIP in the IP Phone?