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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 , 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 :
AP : AIR-LAP1242AG-E-K9       (flexconnect)


Best Regards

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