A call is placed via IAX2 from one asterisk to another, to a TDM400 channel whose extensions.conf entry is

exten => 502,1,Dial(${COLIN})
exten => 502,2,Congestion

If this channel is already busy when called, the call is instantly hungup, without the caller hearing the congestion tone.

The log from the callers asterisk shows:

-- Executing Dial("Zap/1-1", "IAX2/192.168.3.223/502|30") in new stack
   -- Called 192.168.3.223/502
   -- Call accepted by 192.168.3.223 (format 4)
   -- Format for call is 4
   -- IAX2[pbxak]/2 is circuit-busy
 == Everyone is busy at this time
   -- Hungup 'IAX2[pbxak]/2'
   -- Executing Hangup("Zap/1-1", "") in new stack
 == Spawn extension (incoming, 502, 2) exited non-zero on 'Zap/1-1'
   -- Hungup 'Zap/1-1'

Is this expected behavior, or have I missed something in the configuration?

Thanks,

Richard



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