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A one-way audio media flow is established between the AVMCU and a Lync 2010 client

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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).

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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.

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Resolution

To resolve this issue, install the following cumulative update:
2514978 Description of the cumulative update for Lync Server 2010, Conferencing Server: November 2011


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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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Keywords: kbqfe, kbsurveynew, kbfix, kbexpertisebeginner, kb

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Article Info
Article ID : 2621834
Revision : 1
Created on : 1/7/2017
Published on : 11/19/2011
Exists online : False
Views : 193