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Your Partner for Office electronics


  • Strong AES encryption
  •  SIP profiles and 2 FXS ports
  •  3-way voice conferencing

The Grandstream HT812 is an advanced 2-port analog telephone adapter (ATA) with 2 FXS ports and an integrated Gigabit NAT router. Built upon Grandstream’s market-leading SIP ATA/gateway technology, this powerful ATA features exceptional voice quality, strong encryption, automated provisioning and device management, and outstanding network performance for home and office use.

Grandstream HT812 Key Features

  • Supports 2 SIP profiles and 2 FXS ports
  • Strong AES encryption with security certificate per unit
  • Automated & secure provisioning options using TR069
  • 3-way voice conferencing per port
  • Exceptional voice quality with wideband HD codec
  • Supports T.38 Fax for reliable Faxover-IP
  • Supports dual Gigabit network ports
  • High performance NAT router


  • Telephone Interfaces: Two (2) RJ11 FXS ports
  • Network Interfaces: Two (2) 10/100/1000Mbps RJ45 ports
  • LED Indicators: POWER, LAN, WAN, PHONE1, PHONE2
  • Factory Reset Button: Yes

Voice, Fax, Modem

  • Telephony Features: Caller ID display or block, call waiting, flash, blind or attended transfer, forward,hold, do not disturb, 3-way conference
  • Voice Codecs: G.711 with Annex I (PLC) and Annex II (VAD/CNG), G.723.1, G.729A/B, G.726, iLBC,OPUS, dynamic jitter buffer, advanced line echo cancellation
  • Fax Over IP: T.38 compliant Group 3 Fax Relay up to 14.4kpbs and auto-switch to G.711 for FaxPass-through
  • Short/Long Haul Ring Load: 3 REN, up to 1km on 24AWG line
  • Caller ID: Bellcore Type 1 & 2, ETSI, BT, NTT, and DTMF-based CID
  • Disconnect Methods: Busy Tone, Polarity Reversal/Wink, Loop Current


  • QoS: Layer 2 (802.1Q VLAN, SIP/RTP 802.1p) and Layer 3 (ToS, Diffserv, MPLS)
  • DTMF Method: In-audio, RFC2833 and/or SIP INFO
  • Provisioning and Control: HTTP, HTTPS, SSH, TFTP, TR-069 , secure and automated provisioning using AESencryption, syslog


  • Media: SRTP
  • Control: TLS/SIPS/HTTPS
  • Management: Syslog support, SSH, remote management using web browser


  • Universal Power Supply:
    – Input: 100-240VAC, 50-60Hz
    – Output: 12V/0.5A
  • Environmental:
    – Operational: 32º – 104ºF or 0º – 40ºC
    – Storage: 14º – 140ºF or -10º – 60ºC
    – Humidity: 10 – 90% Non-condensing
  • Dimension: 28.5 x 130 x 90 mm (H x W x D)
  • Weight: 353.33g


  • FCC/CE/RCM, K.21
  • HT802 Telephone Adapter
  • UK Power Adapter
  • Ethernet Cable
  • Quick Installation Guide
  • GPL Statement
Whats in the Box
  • HT812 Telephone Adapter
  • UK Power Adapter
  • Ethernet Cable
  • Quick Installation Guide
  • GPL Statement

Next Day Delivery
For UK orders received before 12pm Monday to Friday, we operate a next business day delivery service, subject to availability. We use next day services from the leading delivery companies.

Specific Time Delivery
If you need an item urgently, or delivered at a specific time, please contact us.

Delivery Methods
We use several leading delivery companies. The majority of our deliveries are made by
DPD, including most international orders.

Shipping prices are calculated during the checkout process.
We deliver to almost every country. For international delivery services, we use DHL, a high quality, fast delivery service. Prices are provided based on the weight of the order; this is calculated when you reach the checkout.

For full shipping information please visit our shipping page.

VoIP Packages

Hosted Business VoIP Provider Unlimited Calls from £5/month
If you’re looking for a reliable and competitive VoIP provider for your small business, we can offer you one of the UK’s most trusted services. No need to compromise on quality, either. The capabilities of our VoIP PBX system have been developed over a decade, with our roadmap for the future incorporating even more improvements. Your business VoIP is in safe hands with us.

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SIP Trunking

With SIP trunking, your business can operate its own on-site IP PBX system. Xinix has been offering our own SIP trunk solutions for over 10 years.

Business SIP trunking is a service that enables your company to operate a selection of telecommunications systems over your IP network. It offers a number of benefits – from cheaper international call costs to improved business flexibility. Incorporating a Disaster Recovery strategy to give access to an increased quantity of numbers, business SIP trunking from Xinix World can enhance the way your business stays connected.

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£54.03 Excl. VAT

0% Interest offers available

1 in stock

  • In Stock
  • Order within 11 hours for delivery on Sun, 16th June