TIPS Help With PJSIP Setup

[dallas]

I have 2 Incredible PBXs. One in my home (Incredible PBX/FAX 2021.01 for Raspberry Pi4) the other in Oracle Cloud (Incredible PBX for Oracle Cloud with Ubuntu 20.04).
I am trying to setup a PJSIP trunk between them. Because the Pi4 is behind a firewall with no ports forwarded it needs to register to the Oracle PBX.

When the Pi4 registers the Oracle log shows "Registration from '<sip:Oracle@IP of Oracle PBX>' failed for 'External Address of Pi4 PBX:5061' - wrong password."

The error in the Pi4 log shows "403 Forbidden fatal response received from 'sip:IP of Oracle PBX' on registration attempt to 'sip:Oracle@IP of Oracle PBX', retrying in 30 seconds".
20 seconds later "Contact Oracle/sip:Oracle@IP of Oracle PBX is now reachable". The FreePBX Asterisk Info report on both PBXs show offline.

Here are the Trunk PJSIP Settings from each PBX.

 

[billsimon]

On the Oracle Cloud PBX, is the trunk named Oracle?

 

[dallas]

On the Oracle Cloud PBX, is the trunk named Oracle?

Yes. The name is the same on both PBXs

 

[Samot]

Yes. The name is the same on both PBXs

Why do you need registration? You could just auth by IP.

 

[dallas]

Why do you need registration?

Because the Pi4 is behind my gateway without any port forwarding.

 

[wardmundy]

@dallas: Have you read...

Interconnecting Asterisk Servers with PJsip and OpenVPN – Nerd Vittles

nerdvittles.com

 

[billsimon]

Please share the log and/or a SIP capture.

 

[dallas]

@dallas: Have you read...

Yes, many times but I wanted to set it up without a VPN.

@Samot was correct. To my surprise IP authentication worked without any holes in the firewall. So my assumption that registration was required to navigate the firewall was wrong.

 

[ostridge]

Because the Pi4 is behind my gateway without any port forwarding.

The registration is initiated from the Pi4b and the router keeps tabs on you outgoing connections in order for the returned incoming connections to be kept open.

As my phone's connected to Pi are all Internal then My Pi never has any ports forwarded it just works.

 

[dallas]

The registration is initiated from the Pi4b and the router keeps tabs on you outgoing connections in order for the returned incoming connections to be kept open.

Yes I saw that in the logs. The 1st registration attempt fails and the second succeeds.