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Cisc CUCM 7.1 Hunt Group Ringing Too Long

Posted on 2011-03-21
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Last Modified: 2012-06-27
I have an operations center with 11 phones - 7945G and 7965G.  I have a hunt pilot/list/group setup with Broadcast as the distribution algorithm.  So all the phones rings when a pilot number is dialed.  But the problem is when someone picks up - the phone keeps ringing for one or two more rings after pickup.  And the audio doesn't kick in for another 5 to 10 seconds.  Anyone have a thought on what might be causing the delay?
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Question by:amigan_99
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by:lrmoore
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Have you tried changing the RNA Reversion Timeout on the Line Group?
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by:José Méndez
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You have either a busy server/cpu, or network delays. CallManager completely under control of the IP Phone in SCCP mode, and is the responsible of sending the instruction to stop ringing. In the trace files you should see a StationInit message which is the phone communicating the server that it went off-hook to answer the call, and then a StationD message which is CallManager telling the phone to stop ringing. Both messages are timestamped and can be compared. Let me know if you need help with the traces.
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by:amigan_99
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Thanks Willy - so actually the server is over-spec'd and CPU is always cool - 3 - 4%.  And network delay is always sub 30ms and on average 16ms.  The insight on the Call Trace is awesome.  
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by:amigan_99
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On a related note - do you know at a packet level how the broadcast is done?  Clearly it's not a broadcast in the networking sense but a series of unicasts.  I have 11 phones on that broadcast hunt group.  Could it be possible that say just the 1st phones in the group might see an issue as these unicasts have to be sent say one per second to each phone in the group?  e.g in 1st second phone 1 rings, 2nd  second phone 2 and so one?  So if phone 1 is picked up immediately but the other 10 phones haven't rung yet perhaps the ringing has to complete to all phones before ringing is stopped on phone 1 and voice commences??  
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José Méndez earned 500 total points
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No, phones should stop ringing when one of them picks up. As you say, it is not a broadcast. At an IP level, CallManager sends Skinny packets instructing to ring, targeted at each individual phone. This happens at same milisecond.
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by:amigan_99
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I have not been able to re-create the issue the last couple of days.  But your answers give me much to go on.  Thanks.
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