[pjsip] Intertup by GSM call put call on hold. When unhold the call it has no audio

DAO CUONG daocuong at gmail.com
Sat Dec 14 21:37:18 EST 2013

I use PJSIP for ios, when VoIP call has interrupted by GSM call, i put the
call on hold then after GSM call end i unhold the call, sometime it has
audio and sometime it has no audio.

The call has no audio when i see following line :

*ValidateRequiredFields: Unknown selected data source for Port iPhone
Microphone (type: MicrophoneBuiltIn)*

*Is any experienced above error or point me out the way to solve this
problem *


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