... Multiple models optional VJtech VoIP access gateway has 10 available models: VJ-1S1P,VJ-2S,VJ-4S ... -45 VJ-16S/16O or VJ-8S8O: 4LAN, 10/100M Base-T, RJ-45 SIGNALLING & PROTOCOLS SIP ... TFTP, HTTP, TELNET, ICMP, STUN, NAT, DHCP client/server, PPPoE client, DNS, DNS SRV Voice Transport RTP/RTCP, Real- ... C Storage: -4~176F /-20~80°C Humidity: 10%-90% non-condensing REGULATORY COMPLIANCE Certification CE, FCC ...