Lync external conference call gets disconnected after 10 seconds

We have the following scenario:

- 1 Std Lync 2010 FE Server
- 1 Lync 2010 Edge Server
- 1 Lync conference with 2 or more user with Lync 2010 clients external
- 1 Lync Conference call - Invitation via Outlook Lync Online Meeting

When we conduct a Lync conference  call with some external clients, we see the following issue by some clients:
- Lync 2010 external Client connects to the conference and can talk
- after 10 Seconds the client gets disconnected
- the client tries again and gets disconnected after 10 seconds again
- after several tries the client stays in the conference
- the call diagnostics on FE says:
ms-clinet-diagnostics:23:reason="Call failed to estblishe due to a media connectivity failure when one endpoint is internal ant the other is remote

We have this issues only with about 10% of the clients. Furthermore if we do the same conferencing with the same client on another Internet Provider, we don't run in this issue and everything just works perfectly.

Calling from the same external user to an internal user (peer to peer) works just fine for all clients.

Any help would be appreciated - Bueschu

May 21st, 2015 8:51am

It seems a network problem. You can use simple pings to check if there's packet loss occurs.
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May 22nd, 2015 2:00am

It seems a network problem. You can use simple pings to check if there's packet loss occurs.
May 22nd, 2015 5:59am

It seems a network problem. You can use simple pings to check if there's packet loss occurs.
Free Windows Admin Tool Kit Click here and download it now
May 22nd, 2015 5:59am

It seems a network problem. You can use simple pings to check if there's packet loss occurs.
May 22nd, 2015 5:59am

Hi Bueschu,

you can check the User Activity Report, it provides Lync audio quality metrics for peer-to-peer and conferencing activities.

And here is a reference table that shows parameter values.

Best regards,

Eric

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May 31st, 2015 9:36am

Hi

Upgrading / Changing the internet router of a client user helped to solve the problem for this specific user. Now we are checking other users.

Best Regards - Bueschu

June 1st, 2015 1:50am

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