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A one-way audio media flow is established between the AVMCU and a Lync 2010 clientArticle ID: 2621834 - View products that this article applies to. SYMPTOMSAssume 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). CAUSEThis 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. RESOLUTIONTo resolve this issue, install the following cumulative update: 2514978
(http://support.microsoft.com/kb/2514978/
)
Description of the cumulative update for Lync Server 2010, Conferencing Server: November 2011 MORE INFORMATIONFor 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
(http://technet.microsoft.com/en-us/library/dd572310(office.13).aspx)
PropertiesArticle ID: 2621834 - Last Review: November 19, 2011 - Revision: 1.0
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