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iCobretti's avatar
iCobretti
Copper Contributor
Oct 11, 2022

PSTN Teams inbound calls keeps dropping

Hi all,

I have a problem with Teams Client app, when I receive PSTN calls Teams immediately drop it and I can't answer.

The stranger thing is that with web browser app (teams.microsoft.com) is working fine.

The steps I tried solving the issue are:

- Uninstall and reinstall Microsoft Teams app

- Clear Teams Cache in C:\users\userprofile\appdata\roaming\teams

- try to delete and then re-assign the calling plan license to my user in 365 admin center.

- verify the Teams policy applied to my account that are the same as other users where it works fine

 

Outbound calls works correctly.

I really don't know what to do.

Can you please help me?

 

Thanks a lot

Regards

Matteo

Calling
microsoft teams
teams calls
  • jangliss's avatar
    jangliss
    Steel Contributor
    Oct 11, 2022

    iCobretti 

     

    • Are you using direct routing?
    • If yes, what SBC are you using?
    • If using direct routing, are you using media bypass?
    • Is it all inbound calls drop?
    • Is it an immediate drop, or is there a delay of a few seconds?
    • Do you hear any audio on either side?
    • iCobretti's avatar
      iCobretti
      Copper Contributor
      Oct 11, 2022

      jangliss 

      hi

      yes i'm using direct routing and SBC like all my colleagues

      is an immediate drop and the calls go immediately to "lost calls" in Teams, from the other phone i can't see any audio and the call go in error after few seconds

       

      here some settings for my user that are the same as the other users

      AllowPrivateCalling TRUE

      AllowWebPSTNCalling TRUE

      AllowSIPDevicesCalling FALSE

      AllowVoicemail UserOverride

      AllowCallGroup TRUE

      AllowDelegation TRUE

      AllowCallForwardingToUser TRUE

      AllowCallForwardingtoPhone TRUE

      PreventTollBypass FALSE

      BusyOnBusyEnabledType ENABLED

      PopoutForIncomingPSTNcalls DISABLED

      SPAMFilteringEnableType ENABLED

      AllowCallRedirect DISABLED

       

      thanks

       

       

      • jangliss's avatar
        jangliss
        Steel Contributor
        Oct 13, 2022

        iCobretti 

         

        Do you know if you're using media bypass?  What operating system? I'm assuming Windows? I see you mentioned that you're on the same network as others that do not have the same problem, so that should in theory eliminate a network firewall, what about firewall on the workstation? Can you disable it and retest?

         

        There are different port requirements between the Windows client, and the browser client.  Teams should handle the firewall stuffs automatically, but it might still be an issue.

    • iCobretti's avatar
      iCobretti
      Copper Contributor
      Oct 11, 2022
      Hi Steven,
      thanks for your response.
      I exclude network/fw issue because i'm in the office and my other colleagues, connected to the same network, do not have this problem.
      And also, as i posted, with web app works normally

      i don't know what to do

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