Support SIP2.0, TCP/UDP/IP, RTP/RTCP, HTTP, ICMP,ARP/RARP, DNS,DHCP (both client and server), NTP, PPPoE，TFTP, etc.
Built-in router, NAT and Gateway

Powerful digital signal processing (DSP) to ensure superb audio quality; advanced adaptive jitter control and packet loss concealment technology
Ultra compact (wallet size) and lightweight design, great companion for travelers
Support various vocoders including G.711 A-/U-law, G.723.1, G.729A/B, G.728, G.726, iLBC.

Support Caller ID/Name display or block, Hold, Call Waiting, Call Transfer, Call Forward, Flash, Three-Way Conferencing (pending)
Support customizable ring tone (pending)
Fax pass through and T.38 (pending)
Support silence suppression and VAD, AGC, and echo cancellation (G.168)
Support standard encryption and authentication (DIGEST using MD5 and MD5-sess)

Support layer-2 (802.1Q VLAN, 802.1p) and layer-3 (DiffServ, ToS) QoS
Support automated NAT traversal without manual manipulation of firewall/NAT
Support remote automated provisioning and software upgrade even through firewall/NAT to enable “zero configuration” and “plug-and-dial” for end users
Support device configuration via built-in IVR, Web browser or central configuration file
Support DNS SRV Look Up
SIP Server Fail Over (pending)