I have done my homework on this, I hope.
I have a customer with an ATA186 who uses Nufone as his IAX provider. His network operations center in the Bahamas was destroyed by the hurricanes, and I'm helping him rebuild.
We have a nagging problem getting his ATAs (located in public IP space) to talk through his IAX provider (Nufone) to the outside world. As far as we know, things worked OK before, but when we reconstructed things something must be awry.
He dials on the ATA, we see the call being picked up normally by Asterisk, the provider accepts the call and shows the codec being used, and then immediately hangs up.
The (sanitized) sip debug output at that point looks like this:
-- Call accepted by W.X.Y.Z (format ULAW)
-- Format for call is ULAW
-- Hungup 'IAX2/Carrier/7'
== No one is available to answer at this time
-- Executing Congestion("SIP/blah-blah-76d6", "") in new stack
Transmitting (no NAT):
SIP/2.0 503 Service UnavailableI have confs and dumps but they're laden with his IPs and passwords, etc. I can sanitize and post them if it's helpful, but perhaps someone there would know some canonical circumstance that leads to this error.
I set up a context with parameters as nearly identical as I could to point his server at mine here in my office, and the call zipped right through, same phone, same parameters in the config, same codecs.
Thanks.
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