* Dual FXS RJ11 Ports
* PSTN Pass-through capability

* 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, Auto Answer (Intercom), Flash
* Support customizable ring tone and fax pass through
* 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