VoIP E1/T1/PRI Gateway Yeastar TE100/TE200 — Digital Trunk for IP Systems

The Yeastar TE Series comprises VoIP E1/T1/PRI gateways designed to integrate digital E1/T1/J1 trunks into SIP-based VoIP infrastructure, enabling bidirectional communication between ISDN and IP telephony networks. These gateways are deployed to connect legacy PBX systems to modern VoIP services or to bring E1/T1 trunks into IP-only environments — addressing migration scenarios where a full transition to VoIP cannot be executed immediately. The TE100 provides 1 E1/T1/J1 port supporting up to 30 concurrent calls; the TE200 offers 2 ports with up to 60 simultaneous sessions.

E1/T1/J1 ports are software-configurable with programmable TE/NT modes and support for PRI signaling including Euro ISDN, Nation, and Q.SIG, CAS MFC R2 across multiple regional variants, and SS7 in ITU, ANSI, and China formats. Voice processing covers G.711, G.722, G.726, G.729A, GSM, and ADPCM codecs, ITU-T G.168 echo cancellation, and SIP transport secured via TLS and SRTP. T.38 fax support ensures reliable fax transmission over IP networks without quality degradation.

The TE Series integrates with existing ISDN PBX systems, IP-PBX platforms, and softswitches via SIP RFC3261 without replacing active telephony equipment. Gigabit LAN/WAN interfaces combined with DDNS, NAT traversal, QoS/ToS, PPPoE, and static routing support deployment across complex business network environments. Administration is fully web-based, with E1/T1/J1 diagnostics, packet capture tools, and firmware upgrade via HTTP/TFTP.

The Yeastar TE Series is deployed for connecting legacy PBX systems to VoIP services via SIP trunking, integrating E1/T1 trunks into IP-only telephony systems, and interconnecting multiple PABX locations over IP networks for cost-free inter-office calls. Typical use cases include contact centers requiring ISDN connectivity, branch offices linking IP-PBX to headquarters, and organizations executing phased migration from PSTN/ISDN infrastructure to VoIP.