We have OCS R2 setup to use Asterisk to make calls out to the PSTN (via the Avaya phone system). This has been working great for a few years. All of a sudden this weekend we started seeing the error below. Any ideas what is causing this? The call starts when an OCS user dials a number, the call is passed off to Asterisk who then should pas the call to the Avaya PBX as H.323. Worked fine up to now.
(FYI - I removed the real IP address and replaced it with x’s below)
== Everyone is busy/congested at this time (1:0/0/1)
– Auto fallthrough, channel ‘SIP/xxx.xxx.xxx.xxx-09606970’ status is ‘CHANUNAVAIL’