I wanted to record a teamviewer meeting with the audio strem of the parallel running conference call on the same PC with an installed softphone,
While using a headset at the PC it is impossible as confimed by the Teamviewer support.
But I managed to get this working by using:
All audio information of the conference call was send into the room and simultaniously recorded by the separate microphone by the teamviewer meeting.
This is not possible in larger offices, and maybe not with a perfect voice quality, but in my case it was a good solution with a good voice quality.