Problem about roaming when using IP Phone 792X

Hi Guys,
My Customer is wiht the following problem: When the user is using the IP Phone 792X near the Access Point the call worked Ok. When the User to do the roaming to another Access Point He hear audio only one side. If He turn off the IP Phone and turn on the call came back work. I don´t sure, but, I don´t believe that the problem is the IP Phone Configuration. My question is: Can be any problem about Wireless Controller configuration?
Information about the equipament:
IP Phone 792X Firmware -
CP7921G-1.3.3.LOADS
CP7925G-1.4.1.LOADS  
Access Point
Model:  1140
Wireless Lan Controller
Model: WS-SVC-WISM-1-K9
Product Version.................................. 6.0.188.0
Thank You,
Wilson

Hi Wilson,
The first thing I would check is that you have proper cell overlap.
See page 3-13 in the deployment guide:
http://www.cisco.com/application/pdf/en/us/guest/netsol/ns279/c649/ccmigration_09186a00808d9330.pdf
Without seeing more info, we can't conclude that this is a controller code issue, but I'd upgrade the controller to 6.0.202 to be sure.
6.0.188 is deferred:
http://www.cisco.com/web/software/Wireless/Deferral/Software_Advisory_6_0_196_0.html
You may also want to run your controller's config through the config analyzer and enable 792x voice checks:
https://supportforums.cisco.com/docs/DOC-1373
hth
jeff

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    hth
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