The 3 phone jacks to PC USB with USB to RS-232 adapter...
Here is a picture of what I use. The dongle is a just a DB-9 to RJ-11
female. I get them from Ebay. Would be nice if they came pre-connected
but you have to stick the 3 wires into the proper holes of the DB-9 part and
all of these dongles aren't necessarily using the same colored wires going
to the same RJ-11 pins, so it's not 100% accurate to just say that the red wire
goes into DB-9 pin 5 or whatever. I've seen more than one style of this.
The dongles I found on Ebay were the same though, from the same
vendor. Just search for...
Lot10 DB9pin Female~RJ12/RJ11
I got 20 of them from partsparadiseinc
Couldn't find the whole cable pic yet but here's one trying to
document wiring it up...
Looks like RED is pin 2, GREEN pin 3, YELLOW pin 5 (gnd)
At least from the ones I got from partsparadiseinc
And also using the normal, reversing RJ-11 to RJ-11
cable we ship with the Classics.
If not the same, then you will have to ring it out which
is kind of a pain. I would just buy a package of 10 from
partsparadiseinc... Pretty cheap.