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Overview
The HT-922 is designed as a compact, high performance, and low cost
VoIP Analog Terminal Adapter (FXS Gateway). It
offers two FXS ports to interface with traditional analog phones or PBX trunk lines
for VoIP communications. It bundles with lots
of features to meet the demand in various
network environment. It is an ideal low cost VoIP solution for travelers, SOHO
and SME users. |
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Key Features
- Open Standard VoIP Protocols (ITU H.323 V4 and IETF SIP
V2)
- Two 10/100 Ethernet for WAN / LAN connections
- Peer-to-Peer IP Calls
- Speech quality ensured by QoS at the Ethernet and IP
layers and comprehensive jitter buffer
- Line Echo Cancellation
- VLAN and QoS support
- NAT Transversal and Router functions
- Voice prompts, HTTP Web, Auto Provision support for configuration
and updates
- Highly stable embedded Linux operating system in high
performance ARM 9 Processor
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Basic Features
- Two RJ-11 FXS ports for traditional phone set or
PBX's trunk line
- LEDs for Power, Ready, Status, WAN, PC, FXS
- Call Forward, Call Hold, Call Transfer
- Dial Plan
- Caller ID
Enhanced Features
- Dynamic selection of codec
- Advanced jitter buffer
- Automatic traversal of NAT and firewall
- VLAN / Qos
- Router
- Echo cancellation for Speakerphone
- Comfort noise generation (CNG)
- Voice activity detection (VAD)
- Auto provisioning (requires auto provisioning
server)
- On line firmware upgrade
- Multi-language support: English and Chinese
Supported Standards
- ITU: H.323 V4, H.225, H.235, H.245, H.450
- RFC 1889 - RTP/RTCP
- RFC 2327 – SDP
- RFC 2833 – RTP Payload for DTMF Digits, Telephony
Tones and Telephony Signals
- RFC 2976 – SIP INFO Method
- RFC 3261 – SIP
- RFC 3264 – Offer/Answer model with SDP
- RFC 3515 – SIP REFER Method
- RFC 3842 – A Message Summary and Message Waiting
Indicator
- RFC 3489 – Simple Traversal of User Datagram
Protocol (UDP) Through Network Address Translators (NATs)
- RFC 3891 – SIP “Replaces” Header
- RFC 3892 – SIP Referred-By Mechanism
- draft-ietf-sipping-cc-transfer-04 –
Session Initiation Protocol Call Control - Transfer
- Codec: G.711 (A/µ law), G.729A/B, G.723.1
- DTMF: RFC 2833, In-band DTMF, SIP INFO
Physical and Environmental
Operating temperature: 10°C to 40°C (50°F to
104°F)
Storage temperature: 0°C to 50°C (32°F to
122°F)
Weight: 1.9 kg (4.2 lb)
(Including AC/DC Adapter)
Size: mm (W) x mm (L) x mm (H)
( ” x ” x ”)
Power: 24 Vdc 500 mA (AC/DC
adapter included). Classification 0 under IEEE 802.3af on CN2x4
Safety:
Emissions:
Immunity:
Other Approval:
Warranty: one year
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