The real question is do require ISDN service? If you do, than PRI is the
best way to go. If you are just trying to support dial-in analog modems,
then CT1 is a good choice. However with that said, the PM3's has a unique
implementation for answering calls over a CT1 which permits the answering
of both analog modems and ISDN (56K) data-over-voice calls. So you can get
limited ISDN service without paying for the premium of PRI. ;-)
-- Marty Likier Product Marketing Mgr. marty@livingston.com