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Lync 2013 for Android does not play a busy signal when you call a PSTN number

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Symptoms

Assume that you make a PSTN call by using a Microsoft Lync 2013 for Android client, and that the PSTN number is busy. In this situation, the Lync client plays a ringing tone instead of busy signal. Additionally, you hear the following voice recording:

The number you have dialed cannot take your call right now."

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Cause

This issue occurs because Lync 2013 for Android does not process the Busy subcode or the "486" message that Unified Communications Web API (UCWA) returns.

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