The SIP trunk phone service provider on one of our FreePBX 17 instances blocks foreign CIDs. To get calls from external callers via inbound routes to extensions that have call forwarding set on them (set via *72, or set via UCP…) to work, I had to set the PJSIP trunk to “Block Foreign CIDs” and they now work.
Extension to extension calls to extensions that are forwarding to external numbers still get blocked by the provider and receive the “all circuits are busy” error. What is a fix for those? Thanks