We have Lync 2010 Server On Prem. Our users have Lync 2010 Client on W7 computers. And using Lync soft phones on their computers. We are also using Dialogic Media Gateways. We have 850 Lync users. The problem is affecting about 5% of our employees.

Some users, some of the time have one way audio with Lync to Lync calls while internal (we do have edge servers and federation, which have not been a problem with one way audio). Some of the same users and other users, have one way audio when an outside person calls internally. Placing all of these calls on hold and resuming the call, fixes the issue (fixes=they are able to hear each other on both ends). Or unplugging their headset and plugging it back in, brings the audio back (because this places the call on hold and then resumes the call).

We have run many Wiresharks and traced calls on the server and cannot find the cause for these issues or anything to explain why it happens some of the time with some people.

Has anyone run into this issue? Any and all ideas are welcome. Please let me know if you would like more information.

Thank you.

In which direction is the audio not working? If its always on the transmit side for the user in question I would start by eliminating the headset\local audio as a potential cause. I have seen some strange (similar) behaviour when the end user has multiple audio de

When an outside caller calls in, the internal user cannot hear them, but the outside person can hear the Lync user. When it happens Lync to Lync, it is the person receiving the call, that cannot hear the other person. I have tried multiple different headsets, troubleshooted with different audio drivers and using speaker phone and I am able to reproduce the issue.

You can refer below link {it's same issue}

http://social.technet.microsoft.com/Forums/lync/en-US/d6f565e8-7765-4fbd-b30f-6bbad70dec64/one-way-audio-internal-lync-and-lync-online?forum=ocsedge

Sorry, but this is not the same issue. The above forum says the fix was to change the audio device on the 'outside users computer'. In my case, there is not outside user computer, these are cell phone or a landline.

We do have the issue of internal Lync to Lync calls (they have the same hardware, software and drivers).

Hope that helps to clarify.

Hi,

Please also update to the latest version for the issued Lync clients and then test again.

Best Regards,

Eason Huang

Hi,

I have the most up to date versions of both Lync 2010 and Lync 2013 clients for users installed. The Lync Servers are also up to date.

Hi there,

We have the same issue and have had no luck resolving it. Did you find a fix in the end?