The IP-Pipe G4620 are fully integrated TDM over IP gateways that multiplex 4 x E1/T1
circuits plus one LAN ports over the standard Ethernet/IP network. The G4620 supports
point-to-point and point-to-multipoint applications for TDM over packet circuit emulation
equipments. The IP-Pipe G1620 is designed to support point-to-point applications for a
single fractional E1/T1, and can be used with G4620 for the point-to-multipoint applications
over the IP/Ethernet networks.

IP-Pipe Data Sheet (PDF)