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Use the built-in microphone if a headset is connected

I play AudioSessions on iOS, and I want to use the iphone's built-in microphone as an audio input route, even if an external headset (including a microphone) is connected. I can determine if a headset is connected using the following code:

CFStringRef route; UInt32 propertySize = sizeof(CFStringRef); AudioSessionInitialize(NULL, NULL, NULL, NULL); AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &propertySize, &route); if((route == NULL) || (CFStringGetLength(route) == 0)){ // Silent Mode NSLog(@"AudioRoute: SILENT"); } else { NSString* routeStr = (NSString*)route; NSLog(@"AudioRoute: %@", routeStr); NSRange headsetRange = [routeStr rangeOfString : @"Headset"]; if(headsetRange.location != NSNotFound) { NSLog(@"Headset") //route Audio IN to built-in mic. } .... more code

So any ideas how to do this?

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ios objective-c iphone
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