SIP 2.0 (RFC3261) and Correlative RFCs
2 x SIP Support
IAX2 Support
SRTP Support
BLF Support
Two interfaces 10/100 BaseT with support for bridge or NAT
Support L2TP/Open VPN
4 DSS Keys , 4 Soft Menu Button
128x64 Graphic LCD Display
Voice Codecs: G.711a / u, G.723.1 high / low, G.729a / b, G.722, G.726