IP Phone

1. • Support SIP 2.0, TCP/UDP/IP, RTP/RTCP, HTTP, ICMP, ARP, DNS, DHCP, NTP/SNTP, TFTP protocols
2. • Support IETF STUN and SIMPLE standard extension (Model 102D)
3. • Interoperable with various 3rd party SIP end user device, Proxy / Registrar / Server, and gateway products.
4. • Advanced Digital Signal Processing (DSP) technology to ensure superior audio quality
5. • Advanced and patent pending adaptive jitter buffer control, packet delay and loss concealment technology
6. • Support popular vocoders including G.723.1 (5.3K/6.3K), G.729A/B, G.711 (a-law and u-law), G.726 (40K/32K/24K/16K), as well as G.728 (Model 102D)
7. • Support standard voice features such as Caller ID Display or Block, Call Waiting, Hold, Transfer, Forward, in-band and out-of-band DTMF, Dial Plans
8. • Support 3-way conferencing (Model 102D), full duplex hands-free speakerphone, redial, call log, volume control, voice mail with indicator, downloadable ring tone (Model 102D)
9. • Support Silence Suppression, VAD (Voice Activity Detection), CNG (Comfort Noise Generation), Line Echo Cancellation (G.168), and AGC (Automatic Gain Control)
10. • Support DIGEST authentication (MD5, MD5-sess)
11. • Provide easy configuration thru manual operation (phone keypad and Web interface) or automated centralized configuration file.
12. • Support for Layer 2 (802.1Q VLAN, 802.1p) and Layer 3 QoS (ToS, DiffServ, MPLS)
13. • Remote software upgrade capability via TFTP
14. • Built-in alarm-clock with downloadable music ringing tone (Model 102D)

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