I’ve been looking at the Grandstream HT800 series ATAs to allow analogue telephones to connect to the asterisk server. Based on cost ‘per FXS port’ we settled on the HT802 which is a 2 port ATA (2xFXS ports). They are about £35 (so £17.50 per port) and a couple were ordered.
The HT802 is a fairly new ATA which is still being manufactured and still receives firmware updates and has technical support.
Pulse Dialling (Loop Disconnect Dialling)
Firmware 22.214.171.124 for the HT802 adds “Enable Pause Dialing:” to the web config page. We have tested it with an old BT phone with the ‘rotary dial’ and some newer phones that support DTMF and Pulse Dial (Loop Disconnect Dial) with a MF/LD switch. It all worked well and we can make calls from all the old analogue phones we tried to the asterisk extensions.
Pulse Dialling needs to be enabled on each FXS port in the web config page
Also in the web config menu is “Enable Hook Flash:”
Then it is enabled you can flash the hook (press the hook button down and let it go quickly, putting your first call on hold and allowing you to make a 2nd call. This is handy as it allows you to use call holding and do call transfers. But in practice users just end up having two active calls without realising.
Hook Flash can be disabled on each FXS port in the web config page.
There are settings for SLIC (which we set to UK) and settings for “Enable High Power Ring” which we have not tested yet but may help with long lines.