In a Windows Phone 8 application you needed ID_CAP_VOIP to use
AudioRoutingManager.GetDefault().AudioEndpointChanged
What is the equivalent in a Universal Application? There don't appear to be any VOIP/Audio capabilities listed in the Capabilities tab on the Package.appxmanifest
(I'm starting to think this is impossible in an 8.1 Universal App)
Old question but now I know the answer.
Two things which you need to do: 1. Tag the audio in question as "communications"
How to do this depends on what API you're using. It could be as simple as . Or you might have to call IAudioClient2::SetClientProperties with an AudioClientProperties structure whose AudioClientProperties.eCategory = AudioCategory_Communications.
Tag your app as either a "voice over IP" app or a "voicemail" app You should add file called WindowsPhoneReservedAppInfo.xml to your project with the following contents:
<?xml version="1.0" encoding="utf-8"?>
<WindowsPhoneReservedAppInfo xmlns="http://schemas.microsoft.com/phone/2013/windowsphonereservedappinfo">
<SoftwareCapabilities>
<SoftwareCapability Id="ID_CAP_VOIP" />
</SoftwareCapabilities>
</WindowsPhoneReservedAppInfo>
Look for more detailed explanation here:
Playing audio to the earpiece from a Windows Phone 8.1 universal app
