The HT-342 is designed as a compact, high-performance and low-cost FXO Gateway. The FXO detection is optimized to avoid the hold up of the PSTN line when the other party is disconnected. This has been one of the key issues in the design of FXO gateway. The incoming PSTN Caller ID is also transmitted to the VoIP user for more friendly operation. The HT-342 is a full featured FXO gateway and is designed for easy installation and configuration. It is an ideal solution for VoIP to PSTN termination in both SME and SOHO environments.

HT-342 4 FXO Port VoIP Gateway Key Features
Open Standard VoIP Protocols (ITU H.323 V4 and IETF SIP V2)
Single or Multiple Server Registrations
Two 10/100 Ethernet circuits connect to the LAN and an additional device
Two FXO ports for PSTN terminations
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

HT-342 4 FXO Port VoIP Gateway Basic Features
4 RJ-11 FXO ports for PSTN lines or PBX's extensions
LEDs for Power, Ready, Status, WAN, PC, FXO ports
Call forward from PSTN to VoIP and VoIP to PSTN
Dial in mode or dial out mode only
Dial Plan
Password protection for both PSTN dial in and dial out
Retransmit PSTN Caller ID to VoIP terminal

HT-342 4 FXO Port VoIP Gateway 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

HT-342 4 FXO Port VoIP Gateway 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

HT-342 4 FXO Port VoIP Gateway Physical and Environmental Features
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: 1.9kg (4.2 lb) (including AC/DC Adapter)
Size: mm (W) *mm (L) *mm (H) (”*”*”)
Power: 12 Vdc 500 mA (AC/DC adapter included). Classification 0 under IEEE 802.3af on CN2x4
Warranty: 1 year