We just want to establish communication between a web based client and a PBX.
We want to call and to receive calls etc.
The web client has all information like registrar, user, password and the number to call.
When we use the sample configuration it tries to register with asterisk instead of the registrar.
So, we want to tell asterisk just to communicate with another PBX.
Asterisk isn’t a SIP proxy, it doesn’t forward requests around and optionally do media conversion. Each call leg is independent and incoming registers are handled locally. Without knowing the full scope of the deployment and how things work for your setup, can’t really say whether Asterisk would be the right fit or not.