Support SARP/RARP, ICMP, DNS, DHCP, NTP, TFTP protocols

Support NAT traversal via STUN & symmetric RTP

Support SIP SIMPLE standard for Instant Messaging and Presence

Interoperable with various 3rd party SIP end user device, Proxy/Registrar/Server, and gateway products

Advanced Digital Signal Processing (DSP) to ensure superb hi-fidelity audio quality

Advanced and patent pending adaptive jitter buffer control, packet delay & loss concealment technology

Support popular vocoders including G.723.1 (5.3K/6.3K), G.729A/B, G.711 (a-law and u-law), G.726, G.728, and wide-band G.722 (Model 102D). Dynamic negotiation of codec and voice payload length

Support standard voice features such as Caller ID Display or Block, Call Waiting, Hold, TransfForward, FLASH, in-band and out-of-band DTMF (RFC2833), Dial Plans, off-hook auto dial, configurable emergency dialing (e.g., 911), early dial, click-to-dial

Support 3-way conferencing, full duplex hands-fredomain acoustic echo cancellation (pending), redial, call log, volume control, voice mail with indicator, downloadable ring tone

Support Silence Suppression, VAD (Voice Activity Detection), CNG (Comfort Noise Generation), Line Echo Cancellation (G.168), and AGC (Automatic Gain Control)

Support DIGEST authentication and encryption using MD5 and MD5-sess.

Provide easy configuration thru manual operation (phone keypad and Web interface) or personalized automated provisioning via central configuration file for mass deployment.

Support for Layer 2 (802.1Q VLAN, 802.1p) and Layer 3 QoS (ToS, DiffServ, MPLS)

NAT-friendly remote software upgrade capability (via tftp) even from behind firewalls/NATs.

Support for fail-over SIP server and DNS server