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

Article ID: 2621834 - View products that this article applies to.
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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

Properties

Article ID: 2621834 - Last Review: November 19, 2011 - Revision: 1.0
APPLIES TO
  • Microsoft Lync 2010
Keywords: 
kbqfe kbsurveynew kbfix kbexpertisebeginner KB2621834

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