[pjsip] Change from sound output from loud speaker to normal ear speakers on HTC devices

[CalvIA IA]

Hi,

For calls, how to change from loud speaker to normal ear speakers on HTC
devices with WM6?

Tried using "pjsua_set_snd_dev ();"
it returns "Unknown error".
How to retrieve all available playback or output devices?

Thanks.

Calvin
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