We are having issues with outbound calls through Zulu. The calls start, with ringing starting on the recipient side. However, once ringing starts on the far side, the call is immediately hung up on. In logs, we can see a bridge start and then an immediate hangup.
Calls are being routed to another Asterisk machine from the one running Zulu through IAX2 and then out to the world via PRI.
Calls to other Asterisk extensions from Zulu have no problems, and Zulu is able to answer calls coming in through the same PRI/IAX2 path without issue. Calls from desktop phones and other softphone software products have no problems with outbound calls.
Has anyone seen this before or might someone have suggestions for us to check on?