the incoming call show is adding audio, the call can't pick up. 

User is using Lync certificated headset. Others incoming calls is able to pick up.

Any idea?

Thanks.

could you give us some more information about your enviroment.

most likly problems very often firewall, networ configuration problem of the edge server

but this environment doesn't have edge server. Lync 2010 server.

The user is registration on branch SBA server, no firewall between workstation and SBA. 

only this user report the problem now.

Hi,

To narrow down the issue, please test the issue with this issued Lync account on other computer Lync client (use the issued headset, then change to other well-worked headset), check if the issue still happen or not.

If the issue not happen on other Lync client, it can be the issue of Lync user profile, please try to delete the user profile with the following path:

%UserProfile%\AppData\Local\Microsoft\Office\15.0\Lync

Also delete the Lync user configuration information in registry with the following path:

HKCU\Software\Microsoft\Office\15.0\Lync\sip@domain.com

If the issue also happen on other Lync clients, it can be the issue of the Lync account itself, please try to disable it on Lync Server side, and then enable it again to test the issue.

Best Regards,
Eason Huang

If you use a SBA, you have more than one Subnet and mybe the routing is not ok.

You can activate the logging on the client and check the logs for detaile errors.

You can analyze the logs with the snooper tool from the server debugging tools

You can aso test audio on the Lync client with the check audio quality.

Thanks.

But if the routing is not ok , It will not only affect to single user?

• Edited by Jo Tse 4 hours 55 minutes ago a

ok. let's replace headset and monitor the issue.

Thanks.

But if the routing is not ok , It will not only affect to single user?

• Edited by Jo Tse Sunday, March 29, 2015 2:27 AM a

Ok, that's correct, you can test with check audia quality on the client if this user is able to connect to this service.