[USR-TC] ISDN CPE Question

Got the following email earlier and didn't have an answer. Anyone here have a good suggestion? Quick question, Do you know of a good working customer end modem to use on a ISDN line to dial into TC100 (HiPerARC, HiPerDSP,HiPerNMC) gear? I hear that Verizon is going to offer a test ISDN flat rate service to selected 'rural' comunities in my service area (Northern NH) to satisfy political presure to provide 'Broadband' services where no other affordable High Speed conectivity is available. I'd like to be able to offer aN install package with CPE to take advantage of this "_new_" ;-) product in the three towns they (Verizon) are going to run this test case in.