Trunk setup to accept an inbound registration?

[Answerphone (Answerphone, Inc.)]

Is there a way I can set up a trunk so that another PBX we have here can register to it? I want to use it kind of like a makeshift gateway device to the other PBX. Unfortunately, the other PBX will only take registrations and not passwordless peers.

I see when you define the trunk you can enter a registration string, but I believe that’s only for outbound registrations. What about inbound registrations like how I am trying to set up?

[sorvani (Jared Busch)]

@Answerphone

register to it?

Why register? Just use IP or FQDN and FreePBX auto sets up the firewall to allow that IP.

[Answerphone (Answerphone, Inc.)]

I got it to work by just setting up the client as a SIP extension and having it register to that. Seems to be working great. Thanks for the other suggestion though. The problem was this client PBX is proprietary and “unfinished” - it can only handle registration-based connections.

[Stewart1 (Stewart)]

@Answerphone

Is there a way I can set up a trunk so that another PBX we have here can register to it?

Of course. Set up a pjsip trunk with Registration: Receive. If for some reason you must use chan_sip, leave the register string blank and specify
host=dynamic
in the Peer Details.

@Answerphone

I got it to work by just setting up the client as a SIP extension and having it register to that

For most applications, this is not an optimal solution, because caller ID and certain other metadata will not pass through such a connection.