Does anyone knows how to make PC-to-Phone calls not using a companies service?

[frank]

Does anyone knows how to make PC-to-Phone calls not using
a companies service?

I was wondering if the is such a programm to make pc -
to - phone calls without using a specific company. Wopuld
be great to make phone calls out of messenger for
instance...

 

[DFrey]

Would be seemingly impossible. Without the service you don't have the
transport to move voice from internet to telecom network and vice versa.

 

[Ersin]

it can be done... but requires e normal modem connection
wich connects through telephone lines.