The Quadro E1/T1 is a gateway to VoIP networks. It is designed to be connected to an existing enterprise PBX or directly to an E1 or T1 from the PSTN. The Quadro E1/T1 is equipped with one FXS port for connection of a standard analog POTS phone or fax machine. In addition, there is one software configurable E1/T1 voice port. Through the WAN port, your voice and data traffic can be routed to the Internet. Up to 30 simultaneous SIP VoIP calls can be routed through the single Quadro E1/T1. R2, CAS and CCS (PRI) signaling protocols are supported. 1 E1/T1 port to the Central Office (RJ45), 1 Ethernet 10BASE-T (RJ45) for uplink connections.