Hey there! I have three trunks configured on my pbx. When calling them from external numbers, they all work perfectly fine. Calling other extensions internally also works flawlessly. But whenever I try to call one of our external numbers from an internal extension there’s no audio. Phones ring normally, you can pick up the call, but on no side can you hear anything. Any idea why this is happening?
There are several possible causes for this issue; most trunking providers handle on-net calls specially, bypassing their media servers. Most commonly, it’s because your PBX is behind a NAT that doesn’t handle ‘hairpinning’ properly.
The simplest fixes avoid the trunking provider for these calls:
https://community.freepbx.org/t/call-loops/
However, it’s possible that your issue is something other than hairpinning, and calls to or from other users of the same trunking provider will fail. I recommend that you test to confirm that this is not the case, before implementing one of the easy fixes.
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