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2/5/2008 6:38 PM:		T-Mobile and Cingular dropped calls Since I installed Pocket Weather, I have occasionally had dropped calls...it became a little annoying the other days so I thought I would do some "Googling"... Good ol' Google- sure enough there is the following "patch": Summary On the Cingular 8125 device running Windows Mobile 5.0 with AKU 2.0 or the T-Mobile MDA device running Windows Mobile 5.0 with AKU 2.2, the radio will reset after 4 minutes if any applications, including Mobility XE, are attempting to transmit data during a voice call. The hang up is caused by a radio reset and can occur regardless of which application attempts to transmit data during a voice call. Note: Cingular and T-Mobile do not support simultaneous voice and data call when the device has a GPRS or EDGE data connection. The hang up can be fixed by changing a registry setting to prevent the radio from resetting. Symptom When a voice call is active, if an application tries to send data to the data link, after about 4 minutes the radio will reset, terminating both the voice call and the data session. Root cause Due to network conditions, signal coverage and some other factors, there is a small chance the data connection can become detached from the network, but the device is not aware of the detachment. This is normal in real world scenarios. Since data packages can be sent without any error being returned, the device may incorrectly think the connection is still valid. To correct this, HTC introduced a mechanism to watch for such conditions. After the device sends out data without receiving any network acknowledgement for a certain period of time, the device will try to detach from the network and re-establish the data connection. Usually this will silently re-establish the data connection without the user noticing it. Due to radio platform limitations, this task cannot be performed during a voice call. When both of these conditions are met (data being sent out for a period of time with no network acknowledgment, and an active voice call), the device will reset the radio to address the problem. Solution HTC has provided the following registry key setting to disable the auto-correction mechanism: [HKEY_LOCAL_MACHINE\Drivers\BuiltIn\RIL] "GPRSStallWorkaround"=dword:0 More details and a CAB file to help with installation (if you do not have a registry editor) can be found here...
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