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Symptoms

Assume that a Microsoft Lync 2010 client supports Secure Real-time Transport Protocol (SRTP), but does not support Scale-SRTP. When a dial-out call is sent to the Lync 2010 client, a one-way audio media flow is established between the Lync 2010 client and the Audio Video Multipoint Conferencing unit (AVMCU).

Cause

This issue occurs because the AVMCU incorrectly applies the crypto-scale SRTP key to the audio channel. However, the Lync 2010 client uses the non-scale MKI key. Therefore, the client cannot decode media from the conference.

Resolution

To resolve this issue, install the following cumulative update:

2514978 Description of the cumulative update for Lync Server 2010, Conferencing Server: November 2011

More Information

For more information about the method to join C3P addUser dial-out conference, visit the following Microsoft website:

General information about the method to join C3P addUser dial-out conference

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