Voice and IP Phone response delay

All,
We are experiencing an issue with voice delay and even phone response delay during the beginning of a call. When a user picks up the phone there is a noticeable delay before any audio is actually heard (2-5 seconds). Users also complain that they are unable to answer the call, meaning they hit the speaker phone button on the phone but it doesn't repond for a few seconds.
There is an ASA (version 8.4(3)) that is in between the call managers and the remote locations with the IP phones.
I have already checked QoS from the CUCM all the way to the remote end. It is good. I have also not found any packet loss over my network or the carrier network. I do not have access to the data center or the ASA. I currently have the people responsbile trying to prove out their side but I need some ideas on possible problems? Also, has anyone else experienced this and if so what was the problem and the fix?
CUCM Version: 8.6
Phone Load: SCCP42.9-2-3S
Thank you!
Message was edited by: Preston Hartley
Update: The problem does not present itself on every call, when it does happen I see multiple packet retransmissions in wireshark.

The next step I would reocmmend is to run a Wireshark at both the phone and the CUCM node to which the phone is registered. This would let you see what happens: is the packet lost, arriving too late, corrupted, fragmented, etc.
https://supportforums.cisco.com/docs/DOC-11599
The ASA code is capable of doing Layer 7 inspection/manipulation of the SCCP traffic. It could have a bug where it doesn't understand the newer SCCP version or it could be rate limiting the connections to each CUCM server.
Another possibility is that there is traffic shaping somewhere which is delaying delivery of the packets. Again, seeing both sides is probably your best next bet.
Please remember to rate helpful responses and identify helpful or correct answers.

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This question was solved.
View Solution.

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