Zero experience with phone systems. Trying to catch up.

I'd like to try using hyperterm/vmmi/etc with the Impression for programming instead of the attendant phone.

I tried searching the forum as I saw some mentions of a 'recommended' comdial adapter but couldn't find it.

Can I just cut a serial cable and RJ11 end off.. strip them down and match them up according to the pinouts listed in the manual?

Thanks