press 1 for ISP parameters.
Press 2 for calling card parameters.
If phone doesn’t prompt to change the SIP Address. It means you have a LOCKED Phone. In most cases, Locked phones dont allow to change the SIP Proxy Address in calling card menu. If you are unable to change the Calling card user id and calling card password then you may got a locked phone and Locked Phone cannot be unlocked (thats the what, I know. If you get to know how to unlock it then dont forget to tell me as well :)…