7925 Phones voice quality issues with wlc 5508 version 7.6

Hi all,
I have a mix environment with 1 WLC 5508  and more or less 6 sites with several Access Points ( all AIR-LAP1242AG and all in FlexConnect mode  Hreap ) and several wireless phones (all  CP7925G) . My Ap's have antennas 2.4GHz in all sites except 1 site ( the one i'm talking for now) with 2.4GHz and 5GHz , because of the problems we suggest to have all phone in A BAND (5Ghz) . In this site we force the phones just to A (802.11a only) , power safe NONE , Continuous scan mode , i fallow all in http://www.cisco.com/en/US/docs/voice_ip_comm/cuipph/7925g/7_0/english/deployment/guide/7925dply.pdf , one thing i didn’t do it was apply QoS because I can’t apply several ios commands in that 2960 with lan lite ios.
So I have 3 SSID for data and 2 for VOICE  ( one is common to all environment and supports 2.4 and 5Ghz , and other just to test one site , with only 5Ghz  with “[WPA2][Auth(802.1X + CCKM)][Auth(FT 802.1X)]”, because I read that problem can be phone rooming , and in FlexConnect only have fast-roaming in a CCKM or a PKM  key-management solution , but even like this the problem still exist) .
I have another sites with phones in 2.4GHz running well and others with problems.
i read here in forums lots and lots of people with similar problems , i tried several solutions ( WLC  upgrades versions  and phones firmware's , ….  ) tried all my best of solving the problems mas now I’m running without any ideas , i did also some site surveys and detect some interferers that why I change phones to 5Ghz , and I run also WLC Config analyser to help me , but all without good success. Some changes solve temporarily problems , but after some time , people reclaim about problems.
I can open a TAC case but first I want be sure if did all already.
Can someone try to help me?
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.
Tried changing phones also, but still remains.
Question  : i tried to do a linktest from WLC to his phone, but it failed, while linktest to laptops are working fine. Does wlc linktest not working for wireless phones ?
regards
Joe

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    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.
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