Fast dispatch and helpful advice before we placed a multi-site order. Pricing was clear and the product arrived ready for install.
Wesley G.
Grandstream HT813 1-Port FXS and 1-Port FXO ATA
Authorised supply
Project support
UK delivery options
High demand this week
18 buyers viewed this product today. Need project pricing? Our team can quote bulk and renewal orders.
£75.00
Excl. VAT
Need multiples?
Volume discounts for installers, MSPs and resellers.
Fast UK fulfilment
Next-day and timed delivery options at checkout.
Price match help
Send us your project list for a sharper trade quote.
Genuine stock
Authorised supply with UK dispatch options.
Expert advice
Pre-sales sizing from security and IT specialists.
**Product Overview**
The **Grandstream** **HT813** 1 FXS 1 FXO ATA is a hybrid analogue telephone adaptor designed to connect traditional analogue telephones and PSTN lines to SIP-based VoIP networks. Featuring one FXS port and one FXO port, the **HT813** provides a flexible solution for users who need both analogue device connectivity and PSTN line integration. It is suitable for home users, small businesses, branch offices, and organisations migrating from traditional telephony systems while maintaining backup line support. The HT813 also includes built-in lifeline support, allowing the FXS port to automatically connect to the FXO PSTN line during power failures.
The **HT813** combines VoIP functionality with traditional telephony integration through its compact design, advanced voice features, automated provisioning capabilities, and strong security protection.
**Ideal For**
- Home and residential users
- Small businesses
- Branch office environments
- Existing analogue telephone integration
- PSTN backup line connectivity
- Fax machine deployments
- VoIP migration projects
- Remote working environments
**Benefits**
The HT813 allows users to retain existing analogue telephones and PSTN lines while adding SIP-based communication capabilities. This reduces equipment replacement costs and provides a simpler migration path to VoIP services.
- The integrated FXO port and lifeline capability provide additional resilience by maintaining communication availability during power outages or internet disruptions.
- Grandstream HT813 1 FXS 1 FXO ATA
- Power Supply Unit (PSU)
- Ethernet cable
- 1 FXS port for analogue telephone connectivity
- 1 FXO PSTN line port
- Supports 2 SIP profiles
- Dual 10/100Mbps LAN and WAN ports
- 1 FXS port for analogue telephone connectivity
- 1 FXO PSTN line port
- Supports 2 SIP profiles
- Dual 10/100Mbps LAN and WAN ports
- Integrated NAT router functionality
- Lifeline support during power failure
- Supports 3-way voice conferencing
- T.38 Fax-over-IP support
- Failover SIP server support
- TLS and SRTP security encryption
- Automated provisioning with TR-069 and XML files
- Zero Configuration provisioning with compatible Grandstream UCM systems
- Strong AES encryption with unique device certificates
Telephony Features
- 1 × RJ11 FXS port
- 1 × RJ11 FXO PSTN port
- Supports 2 SIP profiles
- Caller ID display and blocking support
- Call hold, transfer, forwarding and waiting
- Do Not Disturb support
- Three-way conferencing
- Flexible dial plan support
- T.38 Group 3 fax relay support up to 14.4kbps
Network Interfaces
- 2 × 10/100Mbps RJ45 ports (LAN/WAN)
- Integrated NAT router
- DHCP client and server support
- QoS support with Layer 2 and Layer 3 prioritisation
Audio Features
- G.711, G.723.1, G.726, G.729A/B, iLBC and Opus codec support
- Dynamic jitter buffer
- Advanced line echo cancellation
- Silence suppression support
Security
- TLS and SRTP encryption
- HTTPS secure management
- AES-encrypted provisioning
- Unique security certificate per device
Management
- TR-069 provisioning support
- XML configuration support
- Web-based management interface
- Syslog and remote management support
Physical
- LED indicators: Power, LAN, WAN, FXS and FXO
- Compact desktop design
- Dimensions: 130.5 × 90.5 × 29mm
- Weight: approximately 142g
**What's in the Box**
- Power Supply Unit (PSU): Power accessory
- Ethernet cable
- Quick installation guide: Included documentation
- Warranty documentation: Manufacturer warranty information
**Shipping and Fulfilment**
- **UK delivery:** Standard, express and timed services are shown at checkout where available.
- **Dispatch:** Stocked products are prepared for dispatch during normal business days.
- **Large or project orders:** Delivery timing is confirmed with the order or quotation.
- **VAT:** Product prices are displayed excluding VAT; VAT is calculated at checkout.
Grandstream HT813 1-Port FXS and 1-Port FXO ATA
£75.00
Excl. VAT
· In stock for trade orders
Trade pricing availableNext-day UK dispatchAuthorised supplyProject quote supportSecure checkoutExpert pre-sales advice
Trusted by trade buyers
★★★★★
4.9 / 5 from 120+ verified reviews
WG
Wesley G
★★★★★
"CLI Secure has been our go-to for Fortinet hardware and renewals. Fast delivery and knowledgeable support every time."
KD
Keith D
★★★★★
"We ordered Grandstream phones for a full office rollout. The trade pricing and next-day delivery saved us both time and budget."
RM
Rania M
★★★★★
"Very professional IT networking supplier. Their pre-sales team helped us spec the right firewall for a multi-site deployment."
JT
James T
★★★★★
"Great stock availability on Hikvision cameras. Everything arrived well packaged and on time. Will order again."
Built for B2B buying
From product selection to deployment, this is made for real projects.
Get the hardware, licences and supporting kit you need without chasing multiple suppliers. CLI Secure helps trade buyers confirm fit, stock, delivery and project pricing before checkout.
1Check compatibility
2Choose fulfilment
3Deploy with support
Trade quote ready
Send your basket for quantity pricing and project supply checks.
Same basket support
Add licences, mounts, switches, storage or accessories with confidence.
Need fit advice?
Ask before checkout and avoid wrong-spec purchases.
Better buying value
Why trade buyers choose CLI Secure
CLI Secure
Best for projects
- Trade and bulk pricing support
- Compatibility advice before purchase
- UK delivery options and account support
- Hardware, renewals and accessories in one place
Generic marketplace
Low context
- Limited project advice
- Unclear warranty or channel source
- Harder to quote bundles and renewals
Buying direct
Slower procurement
- Separate suppliers for accessories
- Less flexible fulfilment for mixed baskets
- More admin for repeat trade orders
Why choose us
Procurement that feels fast, clear and trade-ready.
Every product page is designed to help you move from shortlist to checkout with fewer unknowns.
Authorised supply
Source genuine stock from known B2B channels.
Project help
Ask for fit checks, renewal advice and quantity pricing.
Fast dispatch
Choose UK delivery options for urgent deployments.
Secure checkout
Order online or speak to the team for larger baskets.
Verified buyer feedback
Trusted by installers, resellers and IT teams.
CLI Secure helped us confirm the right supporting accessories and saved us a return. Good trade service.
Keith D.Reliable fulfilment for security hardware and renewals. The team understands what business buyers need.
Rania M.Complete the basket
Related products for this project
Common questions
Product and order FAQs
Can I request trade or bulk pricing?
Yes. For multi-unit, reseller or project orders, contact CLI Secure and our team can review the basket for trade pricing.
How quickly can this be delivered?
Available delivery options are shown at checkout. Many in-stock products support next-day or timed UK delivery.
Can you help confirm compatibility?
Yes. Share the existing setup, model numbers or project requirement and we can help confirm suitable hardware, licences or accessories.
Do you supply renewals and supporting accessories?
CLI Secure supplies hardware, renewals, licences and related accessories across networking, CCTV, VoIP and IT support categories.