... 30 channels 2.selectable E1 (32-channel) or T1 (24-channel) 3.same as didgium card Products ... a with 4 ports, selectable E1 (32-channel) or T1 (24-channel) card that supports all the ... device to fit within a 2U rackmount case or equivalent chassis, offer excellent density for call center, service ... of PBX and IVR services to the network or handset including Three-Way Calling, Call Conferencing,Voicemail ...