Grandstream HT881 FXO Gateway, 8 PSTN Line Ports + 1 FXS, PoE Powered

Overview

The Grandstream HT881 brings up to eight existing analogue landlines into an internet phone system. Your office phone system (IP PBX), whether in the building or hosted, routes incoming and outgoing calls through those lines, so you keep the numbers you already have while staff use internet (SIP, Session Initiation Protocol) handsets. It also has one phone port for an analogue phone or fax, which keeps working on a landline during a power cut.

It suits businesses that are moving to VoIP but want to keep their telecom operator lines, and branch offices that still depend on local landline numbers.

Is it right for you?

• Suits a place with up to eight analogue landlines (PSTN) to connect to a SIP phone system.
• For four lines, the HT841 is the same gateway with four FXO ports.
• It connects lines, not phones: for a block of analogue handsets you need an FXS gateway or HT8xx adapter, which can be peered with this unit.
• It is an indoor desktop unit rated for 0 to 40 °C.

Key features

• 8 RJ11 line ports (FXO, Foreign Exchange Office) for landlines and 1 RJ11 phone port (FXS, Foreign Exchange Station), with 3 SIP profiles.
• Lifeline: during a power cut the phone port is switched directly to a landline, so an analogue phone can still make and take calls.
• Two 10/100/1000 Mbps RJ45 network ports, one of which takes 802.3af Power over Ethernet (PoE), so it can run from a PoE switch without a separate adapter.
• Routing at up to 1000 Mbps in bridge mode and up to 100 Mbps in NAT mode.
• T.38 fax relay (up to 14.4 kbps), G.711 pass-through and 3-way conferencing on each port.
• Codecs G.711, G.723.1, G.726-32, G.729, iLBC and Opus.
• Ring load of 3 REN and up to 1 km of 24 AWG cable.
• AES-encrypted provisioning with a security certificate per unit, SIP over TLS, SRTP, SNMP and TR-069.

What else you need

• An IP PBX or SIP server to create the line trunks on, such as a Grandstream UCM.
• Power from an 802.3af PoE switch or injector (48 V 0.5 A), or a 12 V DC 1 A adapter. No power supply is in the box.
• Analogue landlines from your telecom operator, connected with RJ11 cords.

Installation

Place it indoors on a desk or shelf (190 x 100 x 28 mm, 0.46 kg). Connect the landlines to the FXO ports, the network uplink to the PoE-enabled port and, if wanted, an analogue phone or fax to the FXS port. Then configure the trunks on your IP PBX.

A phone system installer or your IT support should set it up, since trunk routing on the PBX decides how calls flow through the lines.

Software and licences

Configure it from its web interface or through a provisioning server with AES-encrypted configuration and TR-069. Grandstream publishes guides for connecting the HT841 and HT881 to UCM6xxx IP PBXs and for peering them with GXW42xx FXS gateways and HT8xx adapters.

Before you buy

• The box holds the HT881, an Ethernet cable and a quick installation guide. A power supply is not included: plan an 802.3af PoE switch or injector, or source a compatible 12 V DC 1 A adapter separately.
• Routing speed is Gigabit in bridge mode but limited to 100 Mbps in NAT mode.
• The HT841 is the four-line version of the same gateway.