Advantages

U351, an Analog Phone Terminal Adapter for Voice-over-IP will allow you to make phone or fax calls using your broadband connection. U351 is an entry VoIP Gateway that provides a cost-saving, solution for small business or home users for their telecommunication needs. The U351 follows the open standard SIP protocol to make sure that the user can easily install this device on most of existing VoIP(Voice over IP) services. By using the state-of-the-art DSP(Digital Signal Processing) technology, the U351 delivers outstanding voice quality that is very comparable to the PSTN voice quality. U351 is your best VoIP solution in the new generation communication.

Benefits

Following SIP RFC3261 Passing through NAT devices Remote software upgrade capability by FTP Support G.711/ G.723.1 / G.726G.729A/G.729B codec algorithm Speed Dial / 3-Way Call / Call forward / Call Conference / Call Waitting Service domain (SIP) Auto Detection Codec QoS (SIP Traffic) STUN Setting

Hardware

Main Chipset  32-bit RISC CPU with 125MHz clock rate; 16-bit Fixed-Point DSP   with 125MHz clock. Phone Port 1xRJ11 (connect to Phone set) Line Port 1xRJ11 (connect to PSTN Line) WAN Port 1xRJ45 10/100 Base-T Ethernet LAN Port 1xRJ45 10/100 Base-T Ethernet Built-in AC Adaptor 100-240V AC Humidity 10%-95% (non-condensing) POE (Option)                   POE model support 802.3af instead of built-in AC adapter

Software

Protocal and Standards  SIP RFC3261                                                                                                TCP/IP  Internet transfer and control protocol  RTP  Real-time Transport Protocol  RTCP  Real-time Control Protocol  Software  NAT supported    Support major G.7XX (G711,G729,G723,G726) Codec    Dynamic voice jitter buffer, CNG, VAD    Support T30/T38 FAX    G.165 compliant 16ms echo cancellation    E.164 dialing plan and customized dialing rules    Configured by HTTP web browser    Support HTTP, TFTP upgrade    VAD/CNG save bandwidth    Tone generation and Local DTMF re-generation with ITU-T

Others

Dimension   118mm(W) x 74mm(D) x 28mm(H)                      Weight 200 g EMI Compliance UL/EN/FCC Class B