Hi, 

My name is Sang and I use Lync 2013 Basic for online meeting with oversea vendors.

When I conduct 1-on-1 online chatting via Lync with my headset, I do not have any problem to communicate.

However when it comes to a group chatting consisting of more than 3 participants, I have the following problem:

1. I do not have any problem to listen to what the other partitipants are saying.

2. But they can't hear anything I say via microphone.

Can anyone please verify the root cause of this issue? Why such issue keeps happening over and over only on group chatting?

I have been very annoyed by the technical difficulty.

Thanks,

Sang

• Edited by sytheman Monday, February 10, 2014 2:00 AM

Peer to peer or 1-on-1 chatting send the audio peer to peer (not through the server).  When you add another participant, the audio then flows through an A/V Conferencing Server (assuming you're running 2010 server per the forum you posed in, this is often the same as your front end pool).  This sounds like a port restriction or connectivity issue. 

http://technet.microsoft.com/en-us/library/gg398833(v=ocs.14).aspx

http://technet.microsoft.com/en-us/library/gg425891.aspx

If not that, then check your conferencing configuration (are you hosting?), ensure you're not muted, try from a different machine.