SIP (RFCs 3261, 3262, 3263, 3264, 3265, 3311, 2976, 3515)
SDP (RFCs 4566, 2327)
RTP/RTCP (RFCs 3550, 3551, 4586, 5124)
RTP Payload (RFCs 2190, 4629, 2833, 3984, 3951, 4867)
SRTP* (RFC 3711)
NTP/SNTP (RFC 1305)
DHCP (RFC 2131)
Syslogv
PPPoE
Advanced NAT traversal technology to allow plug and play – STUN, TURN, UPnP and keep-alive SIP signaling (RFCs 3581, 4901, 3489)
Local configurable digit map/dial plan
IPV4
TCP
UDP
DNS-SRV
10/100 mbps Ethernet (RJ-45) LAN port
10/100 mbps Ethernet (RJ-45) WAN port
Remotely upgradeable/auto provisioning – TFTP*, HTTP/HTTPS with authentication verification
International clock with online sync-up NTP