TE VoIP E1/ T1 /J1 gateway (VoIP to E1/T1/J1, and E1/T1/J1 to VoIP) supports up to 30/60 concurrent calls. TE Sereis offers SMBs cost effective additions to a legacy telephone system to bring the true benefits of VoIP. Yeastar ISDN VoIP Gateways bridge the gap between traditional ISDN telephony connections such as common RJ-48c / T1 interfaces to provide dial tone to most VoIP PBX phone systems including Yeastar IP PBX. TE Series PRI VoIP Gateway provides an easy and trustworthy conjunction of IP-based system and E1/T1/PRI line. It is suitable when the local IP telephony network is constructed gradually in an institution that already has a legacy E1/T1/PRI network. Any SIP-based VoIP infrastructure, including IP-PBX, hosted IP-PBX, VoIP call center could benefit from this conjunction.