If it comes to lower- to medium-class telephony, TAPI is everywhere. Since Version 3.0 TAPI is okay, but even though controllable via COM, I was not able to use pythons win32com module to make it do what I want (here is a minimalized version of my problematic code).
Having TAPI availabe via python would be really, really nice, but all I could find in the internet, were a couple of other people wishing the same. So if anyone is willing to take the challenge, I’d be glad to help wherever I can.
I’ve got no idea if it would be easier to get TAPI3 working via win32com or to use CTypes to use earlier TAPI-revisions (which are really ugly).