Grandstream HT813 Analog Telephone Adapter – 1x FXS + 1x FXO (VoIP & PSTN Gateway)

Grandstream HT813 Analog Telephone Adapter

Grandstream HT813 Analog Telephone Adapter

Grandstream HT813 Analog Telephone Adapter is a professional hybrid VoIP gateway designed to bridge traditional analog telephony with modern IP communication systems. Equipped with one FXS port for connecting an analog telephone and one FXO port for connecting a PSTN line, the HT813 provides businesses with a cost-effective way to migrate from legacy phone systems to SIP-based VoIP networks without replacing existing analog devices. Whether you operate a small office, retail business, hotel, healthcare facility, or enterprise environment, the HT813 delivers reliable voice communication with enterprise-grade performance and security.

The adapter supports two independent SIP profiles, allowing the FXS and FXO interfaces to work simultaneously. Users can connect an analog desk phone, cordless phone, or fax machine through the FXS port while integrating a traditional telephone line through the FXO port. This flexible architecture enables seamless communication between analog and IP networks while protecting previous investments in existing telephony equipment.

Designed with Grandstream’s industry-leading VoIP technology, the HT813 delivers exceptional HD voice quality using advanced codecs, echo cancellation, adaptive jitter buffer, and packet loss concealment. Every conversation remains clear and natural, making the device suitable for customer service departments, business communications, and remote office deployments where call quality is essential.

One of the most valuable features of the Grandstream HT813 Analog Telephone Adapter is its Lifeline capability. If the internet connection or SIP server becomes unavailable, calls can automatically switch to the connected PSTN line through the FXO interface. This ensures uninterrupted communication during network failures, providing businesses with maximum reliability and operational continuity.

The HT813 also fully supports T.38 Fax over IP, allowing organizations to continue using traditional fax machines over VoIP networks without sacrificing reliability. This feature is especially useful for industries that still depend on fax communication, including healthcare, finance, logistics, education, and government institutions.

Security is another area where Grandstream excels. The HT813 includes enterprise-grade protection through TLS encryption, SRTP media encryption, secure boot technology, unique security certificates, encrypted configuration files, and secure firmware verification. These technologies help protect voice traffic, user credentials, and system configuration against cyber threats while ensuring secure communications across the network.

Deployment is simple thanks to Grandstream Device Management System (GDMS), TR-069 support, XML configuration files, and automated provisioning capabilities. IT administrators can remotely deploy, configure, update, and monitor multiple HT813 devices from a centralized management platform, reducing installation time and maintenance costs for organizations with multiple branches.

The device features one 100Mbps WAN port and one 100Mbps LAN port for stable network connectivity. Its compact desktop design allows easy installation in offices, reception areas, retail stores, warehouses, hotels, and home offices. LED status indicators provide clear information regarding power, SIP registration, network activity, and port operation.

Key Features

• 1 FXS port for analog telephone connection.
• 1 FXO port for PSTN line integration.
• Supports two independent SIP accounts.
• High-definition voice quality.
• T.38 Fax over IP support.
• Automatic PSTN failover (Lifeline).
• TLS and SRTP security encryption.
• TR-069 remote provisioning support.
• GDMS cloud device management.
• Compact and energy-efficient desktop design.

Why Choose Grandstream HT813?

The Grandstream HT813 Analog Telephone Adapter is an excellent solution for businesses that want to modernize their communication infrastructure without replacing existing analog telephones or fax machines. It combines VoIP flexibility with traditional PSTN reliability, making it suitable for hybrid communication environments. Its enterprise-grade security, excellent audio quality, easy deployment, and automatic failover capabilities provide outstanding value for organizations of every size.

Whether you are upgrading an existing PBX, expanding a SIP deployment, or integrating legacy devices into a modern VoIP network, the HT813 offers dependable performance, secure communications, and simple management. Its combination of analog compatibility and advanced IP telephony features makes it one of the most practical analog telephone adapters available for professional use.

Related Links

• Internal Link: IP Telephony Solutions
• Internal Link: Grandstream Products
• External Link: Grandstream HT813 Official Datasheet