2013 Lync users may have failures while sending/receiving file transfers

Applies to: Microsoft Lync 2013

Symptoms


A July 2013 Cumulative Updates Lync client is unable to send or receive files or inline images with another pre-July 2013 Cumulative Update Lync or Office Communications Server client user.

Cause


Because of an underlying interoperability issue, file transfer is broken when Edge server is in the signaling call flow. However, if the two clients are able to send media without Edge in the media flow, then the users won't see this issue.

Resolution


This is a known issue and will be addressed in one of the upcoming Cumulative Updates.