Pc connected behind 7942g network issues

All
I have a situation where computers connected directly to a 7942 ip phone see a large reduction in network speed. If I remove the phone out of the equation and have the computer connected directly to the Ethernet network downloads become 20 times faster. The difference is 10 Kbps with the phone compared to 200 Kbps when not connected to the phone.
I have qos on the network switch, and that is a 3750. There are 2 Vlans . One for VoIP and data.
This site is a branch office with an average latency of 6ms to the main office. There is no firewall between the sites as it is mpls.
The phone system is call manger running version 8 code.
What could be causing such a vast difference in network speeds?
Your suggestions would be extremely helpful as this has become a heated issue. Please help.

Keith,
Did you ever get this resolved? I have a client that is experiencing this same issue.
Thanks

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http://tabletcrunch.com/2012/09/27/fix-ios-6-wifi-problems/
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~~~~~~~~~~~~~~~~~~~~~~~
Look at iOS Troubleshooting Wi-Fi networks and connections http://support.apple.com/kb/TS1398
iPad: Issues connecting to Wi-Fi networks http://support.apple.com/kb/ts3304
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http://www.apple.com/support/ipad/wifi/
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http://ipad.about.com/od/iPad_Troubleshooting/ss/How-To-Fix-My-Ipad-Wont-Connect -To-Wi-Fi.htm
iOS: Connecting to the Internet
http://support.apple.com/kb/HT1695
iOS: Recommended settings for Wi-Fi routers and access points http://support.apple.com/kb/HT4199
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http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
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~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
 Cheers, Tom

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