7925g phones static/hissing and roaming issues

Hello,
We've been having an issue for several months now with our over 200 7925g phones. Nurses are complaining that the phones have static and will drop the voice of the other caller and several times need to repeat the conversation. We have confirmed several scenario's. It occurs when both callers are on 7925g inside the coverage areas in the hospital; between 7925g and 7940 desk phone; 7925g and Nortel desk phone. We've tested on 802.11a and 802.11b/g. I do see a difference when on 802.11b/g however still get a hissing when connecting to a different AP.
4 - 4400 controllers, 6.0.202 firmware
1 - 5508 controller, 6.0.202 firmware
234 - LAP1131AG AP's
6 - AP1131AG AP's
7 - LAP1142N AP's
3 - LAP1310G AP's
AP's are on 6.0.202.0 firmware
7925g's all are on 1.3.3 firmware but we have a select few that we are testing at both hospitals with the newest firmware 1.4.1 and still same results.
235 - 7925g phones.
We have followed the 7925g setup & deployment guide, WLC Config Analyzer and made sure all checks were made. The only setting we plan on testing this week is changing the CCKM authentication change which was recommended. Currently we are WPA TKIP
We have disabled the higher rates (36-54) on the 802.11a.
We also have AirMagnet VoFi analyzer which is showing issues when roaming from AP. The alarms indicate a one-way audio issue and points to the AP's and phones power not matching. We have our Tx power level on the controller to automatic, Max Power Level at 30 dBm, Min. at -10 dBm, power Threshold at -70 (WLC Config Analyzer recommendation). The phone TX Power is set at 8 dBm. Call Power Save Mode has been tested with both None and U-APDS/PS-Poll.
We have a case open with Cisco TAC and she has requested debugs from our controllers. I have sent over 7 and she is not coming back with anything solid and not much help so far.
Our tests between 802.11a and 802.11b/g (RSSI setting on phone Auto-a and Auto-bg) have shown better with the bg mode but still static and/or hissing.
Any help would be greatly appreciated! Thanks.

Thanks!
We finally had an awesome Cisco Engineer on our SR. We straightened out the code and now have the correct 1.4.1.1.1.7 ES image and also configured CCKM.
We are currently testing with about 20 phones before we deploy it to over 200 phones.
Below are the steps we took and so far the tests have resolved the issue.
1. Downloaded & installed the 1.4.1.1.1.7 code on the 7925g's.
2. Changed the Scan Mode on the device in Call Manager to 'continuous'
3. On the Controllers, configured & implemented CCKM on the voice WLAN only.
4. Set the Radio Policy for the Voice WLAN to 802.11a only.
5. Only using channels 36, 40, 44, 48, 149, 153, 157, 161 on 802.11a
6. Disabled the 6,9,36,48 & 54 Mbps rates for 802.11a only
7. Configured the phone with the new voice SSID with CCKM, Security Mode as EAP-Fast, & 802.11 Mode = Auto-a.
We are following up with these test users next week so I will post if this fixes our issue.
Thanks for all the assistance everyone!

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