c# - VoIP app on Windows 10 Mobiles got exception The group or resource is not in the correct state to perform the requested operation -

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i build voip app on wp 8.0 sdk , deploy on microsoft lumia 535 running windows 10 mobile insider preview build 10586.36. make outgoing call failed, tracing log show reason group or resource not in correct state perform requested operation(hresult = -2147019873) when call function requestnewoutgoingcall of class voipcallcoordinator.

after got exception, app can't start outgoing calls when go homescreen, kill app , restart app many times. app can request new incoming call successfully, showing incoming call screen , active call when pressed answer.

right still don't know how reproduce bug. have ideas why request new out going call got exception , how working around bug.


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