If you hope to connect 3CX with GOIP, and you can refer to the file:http://blog.voptech.com/3cx-connects-with-goip/
When you call in the GOIP, the extension will not display the real caller ID, you can refer to the file:
Firstly, let us set the GOIP like this:
Secondly, let us set the 3CX like this:
here we will add two options:
remote party ID-calling party:Display name “callername”caller’s name(default:from->display name)
remote prty ID-calling party:user part “callernum”caller’s number(default:from->user)
that is all the settings.