Softphone Extension — VoiceHost Limited

This extension allows users of the VoiceHost Desktop Softphone to pass tel: callto: protocol tags into dialable telephone numbers and send them to the application dial-pad.
The extension also parses HTML looking for telephone numbers and highlights them on the page.
The extension can be disabled on a per-domain basis.

https://apps.microsoft.com/store/detail/desktop-softphone/9NT2H0K3TJ3V