I wrote a little how to for some testing I did for a customer to see if FreePBX will work for them. This will help others if they have to tie together 2 FreePBX systems.
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Why do you need both an IAX trunk and a chan_pjsip trunk? All this can be done with the single chan_pjsip trunk. There’s no need for the IAX trunk for this.
You can definitely use SIP trunks to connect the systems. I choose not to because IAX Signaling and audio traffic in same traffic stream over a Single UDP port (4569), which makes for Easy NAT traversal, works in all NAT environments. So over the SIP trunks you will have to have RTP opened up for them to pass audio, but the Sip trunk can pass the BLF status over the 5060 and no audio is needed.
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