The base station just has a RJ11 2pin connector for them red and green wires.
And boasts a linkup led. That's about it.
I am using this method: Skype->Sound card->RJ9 connector on old phone->RJ11 connector on old phone to
base station.
I have used a 12V 650mA trafo with a 350 ohm resistor on one wire and switched green and red wires to mimic a PSTN over the modified RJ11. As per a guide at
http://www.wikihow.com/Make-an-Intercom-Using-Telephone-Cable
But if I can hook up my voice modem instead I can get around whatever is causing the problem,
because I really think it'd work? Sure both parties hear both parties at the same time....? But anyhow.
Update: Let me clarify, the oldphone<->soundcard does work. The DECT gladly opens a connection
to it. I have confirmed via USB soundcard by eavesdropping on what the phone is doing and I can
hear the test music I am playing. *sigh*
Update 2: I think there is a mismatch in standards here. The cordless definitely works, I made a
call just now to my cell. Via my landline. I think the base is way too old, you see, I checked up
a bit on things and nowadays it seems 4 pin connection is what the old phone wants, the
black and yellow wires that is. Is there any way to bypass that, aren't those just for handing
calls over to the next phone in a chain?