Grandstream HT881 8‑Port FXO Gateway with PoE & Failover Support

Grandstream HT881: The Bridge for Larger PSTN‑to‑VoIP Networks

The Grandstream HT881 is a robust 8‑port analog FXO gateway, part of the advanced HT841/HT881 series, designed to connect up to 8 analog PSTN lines (such as PTCL) to your VoIP phone system. This enterprise‑grade FXO gateway is ideal for larger offices and environments with higher PSTN trunk requirements.

It helps you get the most out of your broadband network by integrating new IP technology with your existing analog phone system. The HT881 supports 3 SIP profiles through 1 FXS port and can manage multiple locations, connecting all office devices to a hosted or on‑premise IP PBX network to make deployments as easy as possible.

Key Features & Specifications

• High‑Density PSTN‑to‑VoIP Integration: With 8 RJ11 FXO ports, you can connect up to 8 analog PSTN lines to your IP PBX, allowing you to use your existing PTCL lines on a modern VoIP system.

• Built‑in Lifeline for Power Failures: An integrated 1‑port RJ11 FXS interface supports one analog phone or fax machine. If a power outage occurs, lifeline support will hard‑relay the FXS port to an FXO port, ensuring you never lose the ability to make essential calls.

• Flexible High‑Speed Connectivity: Features dual 10/100/1000Mbps RJ45 ports with an integrated high‑performance NAT router. The second LAN port supports 802.3af PoE, allowing the gateway to be powered directly from a PoE switch. Note: Up to 1000Mbps in Bridge mode, up to 100Mbps in NAT mode.

• Superior Audio Quality & Comprehensive Codec Support: Delivers HD voice quality with support for a wide range of codecs including Opus, G.722, G.711µ/a, G.723.1, G.726, G.729A/B, and iLBC.

• Rich Telephony & Collaboration Features: Each FXO port supports 3‑way voice conferencing, with a comprehensive suite of PSTN telephony features, including Caller ID, call waiting, blind/attended transfer, call forward, hold, and DND.

• Strong Security & High Availability: Protect calls and accounts with strong AES encryption and a unique security certificate per unit. The failover SIP server feature automatically switches to a secondary server if the main server loses connection, ensuring business continuity.

• Comprehensive Fax Support: T.38 compliant Group 3 Fax Relay supports Fax‑over‑IP up to 14.4kbps, with auto‑switch to G.711 for fax pass‑through.

• Easy Provisioning & Management: Supports automated and secure provisioning options using TR‑069 and XML configuration files, enabling zero‑touch large‑scale deployments. It also integrates seamlessly with Grandstream Device Management System (GDMS) for zero‑touch, cloud‑based management of multiple devices.

Why Choose the HT881 for Your Business?

The Grandstream HT881 bridges traditional PTCL analog lines with a modern VoIP system, maximizing your investment in existing phone lines while unlocking advanced VoIP features. It is ideally suited for small enterprises with virtual and branch locations, as well as larger offices with higher PSTN trunk requirements, to benefit from IP technology.