No sound after calling await method on WP8

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If before calling MakeCallAudio present "await" method, it is sometimes lost 
sound in the logs is missing string «*INFO: Create audio resampler(G.711a 
codec (From tinyDAV)): producer->audio.rate=48000, 
encoder.codec->plugin->rate=8000, bytesPerSample=2».

Error probability decreases with the addition of "junk" code at the time of 
initialization call, presumably connected with the load on CPU.

Original issue reported on code.google.com by [email protected] on 13 Dec 2014 at 5:49