... didgium card 4.with echo cancellation Products:SinoV-420DE 4 E1 PCI-E digital card without EC module SinoV-420DE-EC ... and powerful interface supporting voice and data transmission over T1, E1, and Primary Rate ISDN (PRI) connections. A low profile, ... Calling, Call Conferencing,Voicemail ,and VoIP Gateways. Interfaces: - 4X E1/T1 interfaces ( E1/T1 selectable) -PCI -E interfaceFeatures:One PRI port 30 ...