Grandstream GXW4504 E1/T1 Digital VoIP Gateway, 4 Spans, 120 Calls

Overview

The Grandstream GXW4504 connects digital phone trunks to an internet phone system (SIP, Session Initiation Protocol). It sits between your SIP network and the digital lines (E1, T1 or J1) from a telecom operator, ISDN trunks or an older digital PBX, with four spans carrying up to 120 calls at once. Larger businesses and call centres use it to keep E1 PRI lines while moving to an IP PBX, or to link an existing TDM PBX with a new VoIP system during a migration.

Is it right for you?

• Suits a business with up to four E1, T1 or J1 trunks to connect to a SIP phone system, or an old digital PBX to bridge into a new one.
• For one or two spans, the GXW4501 and GXW4502 cover the same job at a smaller size.
• It is an indoor rack or desktop unit rated for 0 to 45 °C.

Key features

• Four RJ45 E1/T1/J1 ports for up to 120 simultaneous VoIP calls.
• PRI (Euro ISDN, national and Q.SIG), SS7 (ITU, ANSI and China) and MFC R2 signalling, so it matches what most operators supply on E1 trunks.
• Two Gigabit network ports that can be switched or routed.
• Codecs G.711 A-law and U-law, G.722, G.723.1, G.726, G.729A/B and iLBC, with T.38 fax relay up to 14.4 kbps and G.711 pass-through.
• SRTP, TLS, HTTPS, SSH and 802.1X, plus Fail2ban, whitelist and blacklist protection against call fraud attempts.
• Two USB 3.0 ports, an SD card slot and a 128 x 32 dot matrix LCD.

What else you need

• A SIP server or IP PBX, such as a Grandstream UCM.
• E1, T1 or J1 trunk cables, which come from your service provider.
• A mains socket for the power adapter in the box (100 to 240 V AC in, 12 V DC 2 A out).

Installation

Mount it in a rack or stand it on a desk (485 x 191 x 46.2 mm, 2.38 kg). Connect the trunks to the E1/T1 ports, the network to one of the Gigabit ports, then set up the spans and the SIP trunks to your IP PBX.

A phone system installer who works with digital trunks should fit it. Confirm the signalling type with your operator first, because the span settings depend on it.

Software and licences

Configure it from its web interface. It uses standard SIP over UDP, TCP or TLS towards any compliant IP PBX or soft-switch.

Before you buy

• Confirm the signalling your operator provides (PRI and MFC R2 are common on E1 trunks) and that you need four spans; the GXW4501 and GXW4502 cover one and two spans.
• A SIP server such as a Grandstream UCM is required.
• The box holds a 12 V power adapter and an Ethernet cable with the gateway. Trunk cables come from the service provider.
• Package weight is 3.16 kg.