Windows 11 - TAPI (TSP) crashes - no more calls can be made until restart the service

Question

Hello,

since we use our new pc´s with windows 11 every of our users (non-admin-accounts) report us problems with crashed TAPI-Connection.

After a while (maybe a few hours?) TAPI will not collect incoming calls and outgoing calls reported by "no more calls can be made".

When the problem occurs, we still see the available TAPI line in the trace tool "TapiCaps".

The only solution will be to restart the "TapiSrv"-Service with an admin-account, then all works again.

We already tried to analyze that issue with event-log, but can´t find any related entries.

Answer 1

Hello

Thank you for posting in Q&A forum.
Please try the suggestions below:

1. Check for Corrupted System Files:

• Open Command Prompt as an administrator.

• Run the following commands one by one:

           sfc /scannow

          DISM /Online /Cleanup-Image /RestoreHealth

2. Check for Conflicting Software:

• Some third-party applications might conflict with the TAPI service. Try disabling or uninstalling any recently installed software that might be related to telephony or communication.

3. Registry Check:

• Sometimes, registry issues can cause services to fail. Be very careful with this step:

• Open Registry Editor (press Windows + R, type regedit, and press Enter).

• Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TapiSrv.

• Ensure the settings are correct and there are no missing or corrupted entries.

4. Reinstall TAPI Components:

• If the issue persists, you might need to reinstall the TAPI components. This can be done through the Programs and Features in the Control Panel or by using PowerShell commands.

I hope the information above is helpful.

If you have any questions or concerns, please feel free to let us know.

Best Regards,

Daisy Zhou

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Answer 2

We would be very happy to receive further help here.

Answer 3

Is there any update?

We recently start facing the same issues during the migration from Windows 10 to Windows 11.

For some reason the registration gets lost and as mentioned from Nils it only can be fixed restarting the service or end user device.

We did a lot of testings accross both Plattforms (e.g. new hardware, change user profiles,...) but couldn´t find the issue. All leads to Windows 11.

Thanks for further assistance!