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Grandstream HT704 Setup Guide

PostPosted: 08/13/2014
by Jake
Credits to Val, thank you for your help.

The attached PDF will help you set up your Grandstream HT704 device from scratch. It is a known working configuration so if you are having troubles with your Grandstream HT704 reset back to defaults and follow this guide.

Edit: Set “SIP Registration Failure Retry Wait Time” to 120 seconds.

Enabling "Allow Incoming SIP Messages from SIP Proxy Only" is a good idea for preventing SIP scanners/hackers. However, you may want to change that setting to "No" because FPL to FPL and Fongo to FPL calls may not work with that setting enabled, depending on the server being used and how switches FPL uses are configured. Fongo Home Phone has this setting disabled.

Do what Mango wrote below.

Re: Grandstream HT704 Setup Guide

PostPosted: 02/03/2015
by Mango
To prevent one-way or no audio with the new FPL switches, the firmware of your device may need to be updated. You should be using at least You may download the latest version from

Once the new firmware is installed, set SIP REGISTER Contact Header Uses to WAN address.