no voice when imsdroids join telepresence (MCU)

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Two imsdroid(A and B) join telepresnece. One imsdroid A leaves the audio 
conference, and joins the same conference again. The other imsdroid B can hear 
any voice.

At first, voice can be heard from imsdroid B, but there is no voice heard after 
imsdroid A leaves and joins the same conference. Between imsdroid A leaving and 
joining the same conference,  imsdroid B doesn't receive any audio rtp packets.

Is there anything wrong with low level module about audio in imsdroid?

Look forward to feedback.

Thanks!

Original issue reported on code.google.com by [email protected] on 31 Oct 2014 at 5:50