£0.00
NetXL Logo
Hello! Log InYourAccount
  • Networking
  • Antennas
  • CCTV
  • Smart Home & Security
  • Speakers
  • VoIP
  • Accessories
  • Brands
  • Bundles
  • Reduced
Help & SupportExpress ShippingTrade Account
Explore
  • Brands A-Z
  • Categories
  • Reduced & Clearance
  • Bundles
Trade
  • Apply for Trade Account
  • Trade Account Benefits
  • API
More from NetXL
  • About Us
  • Blog
  • News
  • Careers
Terms
  • Terms & Conditions
  • Privacy Policy
Help & Support
  • Contact Us
  • FAQs
  • Delivery Policy
  • Returns
Apple Pay acceptedGoogle Pay accepted

Unit 4, Riverside Business Park, Walnut Tree Close, Guildford, Surrey, GU1 4UG

Registered in England & Wales. Company No: 13500507 VAT No: GB 386 0823 76

Copyright © 2025 NetXL Distribution Ltd, All rights reserved.

Want it by tomorrow? Order within 12 hours 49 minutes and choose DPD Next Working Day delivery at checkout for next day delivery.

Home
Grandstream
Grandstream HT813 2 Port VoIP Analogue Telephone Adaptor
Grandstream HT813 Analogue Telephone Adapter Right

Click to zoom

Grandstream HT813 Analogue Telephone Adapter Right
Grandstream HT813 Analogue Telephone Adapter Ports

Grandstream HT813 2 Port VoIP Analogue Telephone Adaptor

Part Number: HT813

£92.49inc VAT
£77.08ex VAT

42 In Stock

Want it by tomorrow? Order within 12 hours 49 minutes and choose DPD Next Working Day delivery at checkout for next day delivery.

Easy Returns

Bulk Pricing

  • 1+

    £92.49

  • 5+

    £83.20

  • 10+

    £73.91

The HT813 is a powerful analog telephone adapter designed for users looking to connect their analog devices to a VoIP network in either a home or office. It features 1 analog telephone FXS port and 1 PSTN line FXO port in order to offer backup lifeline support using a PSTN line. The FXS port extends VoIP service to one analog device thanks to the HT813's compact size, HD voice quality and multi auto provisioning options.

Description

The HT813 is an easy-to-use analog telephone adapter (ATA) with 1 FXS port and 1 FXO port. Built upon Grandstream’s market-leading SIP ATA/gateway technology with millions of units successfully deployed worldwide, this powerful ATA features exceptional voice quality in various application environments, strong encryption with unique security certificate per unit, automated provisioning for volume deployment and device management, and outstanding network performance for home and office use. The HT813 delivers outstanding VoIP technology with 3-way voice conferencing per port to home and office environments and allows users to successfully connect their analog devices to a manageable and powerful VoIP network.

Key Highlights

  • Supports 2 SIP profiles through 1 FXS port and 1FXO port
  • Dual 100Mbps LAN and WAN ports
  • Lifeline support (FXS port will be hard-relayed to FXO port) in case of power outage
  • Supports 3-way voice conferencing
  • Automated & secure provisioning options
  • Supports T.38 Fax for creating Fax-over-IP
  • Failover SIP server automatically switches to secondary server if main server loses connection
  • Use with Grandstream’s UCM series of IP PBXs for Zero Configuration provisioning
  • Strong AES encryption with security certificate per unit

What’s in the box?

  • HT813 Telephone Adapter
  • UK Power Adapter
  • Ethernet Cable
  • Quick Installation Guide
  • GPL Statement

Documents

  • Data Sheet:Grandstream HT813 Datasheet

You might also like

yealink-vch51-extender

Yealink MVC-Byod-Extender - Video/Audio Extender

£317.50inc VAT

More by Grandstream

HT802-V2-1

Grandstream HT802-V2 Analogue Adapter

£40.00inc VAT
Grandstream HT801 VoIP Adaptor Front

Grandstream HandyTone HT801 Adapter

£48.49inc VAT
HT812-V2-1

Grandstream HT812-V2 ATA Router

£52.99inc VAT
Best Seller
HT818-V2-1

Grandstream HT818-V2

£110.50inc VAT
New
Grandstream HandyTone HT881 gateway

Grandstream HandyTone HT881 gateway

£241.49inc VAT
HT814-V2-1

Grandstream HT814-V2 ATA Router

£70.99inc VAT
New
grandstream/ht841-front

Grandstream HandyTone HT841 Gateway

£25.00inc VAT

Latest Tech News

Read Blog
What is TP-Link Omada? The Business Network Solution Explained
NetXL 20 May 2026 | 5 min readWhat is TP-Link Omada? The Business Network Solution Explained

See how Omada simplifies business networking with seamless WiFi roaming, centralised cloud management and scalable SDN infrastructure.

DECT vs WiFi: Are Grandstream WP Series Phones Better for Mobile Business Communication?
NetXL 13 May 2026 | 5 min readDECT vs WiFi: Are Grandstream WP Series Phones Better for Mobile Business Communication?

Discover how Grandstream’s WP Series combines WiFi 6, VoIP and Android mobility features to deliver flexible business communication beyond traditional DECT systems.

Why do calls still drop on a fast internet connection?
NetXL 21 Apr 2026 | 5 min readWhy do calls still drop on a fast internet connection?

Exploring how TP-Link solutions improve call quality and network performance

Is the Grandstream GDS372x Series the Best IP Video Door Station for Modern Access Control?
NetXL 30 Mar 2026 | 5 min readIs the Grandstream GDS372x Series the Best IP Video Door Station for Modern Access Control?

Breaking down the Grandstream GDS372x Series, from features and access options to where it makes the most sense.

Why Should You Become A Certified Shelly Installer?
NetXL 30 Mar 2026 | 5 min readWhy Should You Become A Certified Shelly Installer?

Hands-on training, expert guidance, and perks that make your smart home projects stand out!

Why Does Your Router Matter More Than Internet Speed? | DrayTek Vigor 2767 Guide
NetXL 27 Mar 2026 | 5 min readWhy Does Your Router Matter More Than Internet Speed? | DrayTek Vigor 2767 Guide

A practical guide to improving network performance, security, and reliability with the DrayTek Vigor 2767 Series

Understanding TP-Link's WiFi 7 Devices
NetXL 26 Mar 2026 | 5 min readUnderstanding TP-Link's WiFi 7 Devices

A detailed guide to TP-Link’s WiFi 7 range for every home, office, or lifestyle.

Understanding WiFi 7 in Hospitality
NetXL 26 Mar 2026 | 5 min readUnderstanding WiFi 7 in Hospitality

Next-Level WiFi For Every Guest and Space