7921-CME Voice Quality Issue

Hello,
I am running into an issue at customer site which is going on for over 30 days.
They have consistent voice quality issue with 7921 phones.Have checked their phone webpage and see that jitter value increases to 500 during issue. Sometimes I see tcpretransmissions too,
They have QoS but that doesnt seem to help.
I have even collected sniffer off wireless but not able to play due to wireless header.
Have worked with TAC but they do not find any thing conclusive.Can anyone pls tell me what else can be done to analyse and fix the issue

Is the issue with unicast RTP or with multicast (i.e. paging)?
What AP platform and version are you using?
1.2(1) for the 7921 was just released.
1.2(1) Software
http://tools.cisco.com/support/downloads/go/Model.x?mdfid=280808676&mdfLevel=Model&treeName=Voice%20and%20Unified%20Communications&modelName=Cisco%20Unified%20Wireless%20IP%20Phone%207921G&treeMdfId=278875240
1.2(1) Release Notes
http://www.cisco.com/en/US/docs/voice_ip_comm/cuipph/7921g/firmware/1_2_1/english/release/notes/7921_12.html
Other than that ensure the deployment is inline with the 7921G Deployment Guide.
http://www.cisco.com/en/US/docs/voice_ip_comm/cuipph/7921g/6_0/english/deployment/guide/7921dply.pdf

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You have poste in the wrong forum, anyay:
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ip phone 7925G firmware : CP7925G-1.4.5SR1.3
CUCM 8.6.2
WLC    5508 : 7.6.120.0
AP : AIR-LAP1242AG-E-K9    7.6.120.0       (flexconnect)
Best Regards

Hi Serge,
Thanks for the suggestions. I have taken care of all the settings. Problem is , the user is seated in his office cabin and using the 7925 and there is around 50db signal strength in his room from an AP which is just outside the cabin. And this doesnt occur often, when we go to check and make calls, everything is fine whereas the user says it happens sometimes in the morning, evening etc... randomly... where the fone goes blank while in a call.... since the problem never happens when we go to troubleshoot the issue, we really dont know what is going on. This is happening when calling PSTN.
AP's are not restarting and there is no logs indicating that. Wireless infrastructure looks very much OK cos there are other users who are not experiencing this problem and there is ample coverage all over the floor. I am baffled why only one user has this problem even when he is seated in his office cabin.
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7921-CME Voice Quality Issue

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