ETI Technology Co., Limited
Main products:GSM FWP,GSM FWT
Contact Us
  • Contact Person : Ms. Lan Christy
  • Company Name : ETI Technology Co., Limited
  • Tel : 86-755-89335295
  • Fax : 86-755-89337261
  • Address : Guangdong,SHENZHEN,No.218,HUADA BULDING,No.59,TAIZI Road,SheKou,NanShan District,ShenZhen.
  • Country/Region : China
  • Zip : 518000

4 FXS VOIP adapter

4 FXS VOIP adapter
Product Detailed
4 FXS VOIP gateway,VOIP adapter Have encryption built-in; Support VPN; Have router fuction; Can Be Customized;



HT-842R (4 FXS VOIP gateway,VOIP adapter )

The HT-842R is designed as a compact-size, high-performance and low-cost Analog Terminal Adaptor (FXS Gateway). It comes with 4 FXS ports to connect traditional analog phone or PBX trunk lines for VoIP communications.

With easy installation and configuration, this gateway also supports 2 mostly used open VoIP standards (SIP and H.323), which makes it work seamlessly with soft switches or IP PBXs made by various vendors.

Offering high-quality voice, flexible networking and rich functions, it is an ideal low-cost solution for small and medium enterprises where multiple VoIP lines are required.


Functions & Features

Supports open standard VoIP protocols (ITU H.323 V4 and IETF SIP V2);

Supports registration of single or multiple servers;

Supports peer-to-peer IP calls;

Provides two 10/100 Ethernet port for WAN/LAN connections;

High voice quality ensured by QoS at the Ethernet and IP layers and comprehensive jitter buffer;

Supports echo cancellation for speaker;

Supports VLAN and QoS;

Supports automatic transversal of NAT and firewall;

Supports voice prompt, HTTP web, and auto-provisioning (* auto-provisioning server required);

Highly stable embedded operating system of Linux with ARM9 processor;

Supports call forward, call hold and call transfer;

Supports dial plan and caller ID;

Supports dynamic selection of codec;

Supports router function;

Comfort noise generation (CNG);

Voice activity detection (VAD);

Web-based interface: provides parameters setting, multi-layer password, online firmware upgrade, 4-level volume adjustment, voice-speaking IP, toll charging, multi-area prompt tone



ARM9 133MHz


VP-101-4 196MHz




Power interface: AC220V±15% to DC 24V/500mA Ethernet interface for LAN and WAN: 2 RJ45 ports, 10/100Base-T FXS interface: 4 RJ11 ports (feed at 24V / ring at 48V) LED indicators: Power, Run, LAN, PC and FXS ports

Power Consumption

Max. 8W

Voice Characteristics

Supports G.168 algorithm for echo cancellation (16ms) Supports G.723.1, G.711 (A/µ law), G.729A/B, PLC, CNG, and VAD Supports Package Jitter Algorithm

LAN Port Characteristics

Supports DHCP, PPPoE, and Static IP Firewall transversal: relay (* relay server required) or port forwarding Network time: NTP/SNTP 10/100Base-T: 10M/100M adaptive

PC Port Characteristics

Supports Static IP and switch mode DHCP service: supports max. 200 clients 10/100Base-T: 10M/100M adaptive

Supported H.323 Protocols

ITU-T: H.323 V4, H.225, H.235, H.245 and H.450 RFC-1889: RTP/RTCP Supports IP-to-IP

Supported SIP Protocols

RFC 2327: Session Description Protocol (SDP) RFC 2833: RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals RFC 2976: SIP INFO method RFC 3261: Session Initiation Protocol (SIP) RFC 3264: Offer/Answer model with SDP RFC 3265: SIP – Specific Event Notification RFC 3515: SIP REFER method RFC 3842: A message summary and message waiting indication RFC 3489: Simple Traversal of UDP through NATs RFC 3891: SIP “Replaces” Header RFC 3892: SIP Referred-By mechanism draft-ietf-sipping-cc-transfer-04: SIP call control – transfer

Operating Temperature

-20°C ~ +45°C

Relative Humidity Range 

40% ~ 90% (non condensing)


167mm X 112mm X 31mm / 275mm X 170mm X 65mm (packing)


230 g / 530 g (packing)

4 FXS VOIP adapter

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