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Chris4711CD-5942 avatar image
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Chris4711CD-5942 asked JimmyYang-MSFT commented

2 SSTP clients: No ringing while starting a call within Microsoft Teams

Hello,

so we have 2 clients:

  • client A connects to a VPN server vpn.mydomain.com (Windows server 2019 with SSTP and IPv4 only)

  • client B connects to the same server, i.e. vpn.mydomain.com with SSTP

A:

  • client A wants to call client B within Microsoft Teams. A sceen shows up and it is ringing.

  • client B doesn´t see anything. There´s no ringing.

B:

  • client A stops calling client B

  • Now client B sees a missing call from client A

It doesn´t matter which client, as long of one of the clients is connected to the VPN server vpn.mydomain.com and the other client is not connected to the same VPN server, the call works without any problems. If both clients are connected concurrently it fails.

Has anyone ever had such a problem?

Kind Regards

office-teams-windows-itpro
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1 Answer

JimmyYang-MSFT avatar image
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JimmyYang-MSFT answered JimmyYang-MSFT commented

Hi @Chris4711CD-5942,

Do you mean the receiver cannot see any windows notification in Microsoft Teams?

Do you have the same issue in Teams web client?

According to your description, it seems related to your network environment. It recommends you provide an alternate path for Teams traffic that bypasses the virtual private network (VPN). For more details about it, you can refer to:

https://docs.microsoft.com/en-us/microsoftteams/prepare-network#network-optimization

In addition, please try to sign out Teams client and clear cache file to see if it works for you.


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Hi Jimmy,

thank you for your feedback. Indeed the receiver cannot see any windows notifcation in Microsoft Teams while the sender sees a window of the call and hears the ringing tone. As soon the sender stops calling, the missed called appears on receiver side. Our clients do not use the Microsoft Teams web client, so I do not have any information about whether the problems exist with the web browser.

We´re using SSTP VPN since Windows Server 2008 R2 and never had any other issue like that.
"https://docs.microsoft.com/en-us/microsoftteams/prepare-network#network-optimization" describes other problems which we do not have.

Also, every client is affected as soon sender and receiver are connected to the VPN server. It doesn´t matter if it is an old installation or a new deployed windows 10 setup.

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@Chris4711CD-5942

Some customers have feedback the same issue and they resolved it by installing Teams version 1.4.00.7573

https://statics.teams.cdn.office.net/production-windows-x64/1.4.00.7573/Teams_windows_x64.exe

Maybe you can have a try!

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@Chris4711CD-5942

Is there any update on this case?
Please feel free to drop us a note if there is any update.
Have a nice day!

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