Trixbox and Grandstream ATA-488

I have a working HT-488 configured as of the instructions found in:

http://www.voip-info.org/wiki/view/HT-488

search for Mervyn Sirju comment posted Friday 05 of May, 2006

I had to do everything that he suggested, and it worked! Please be aware that there is a new Beta firmware for this device, that for me solved a nasty echo I had with the FXO port.

I reproduce Mervyn's post here for completion:

After much struggling, I've managed to get the FXO port on the HT-488 to work perfectly as a trunk with FreePBX (AMP/Asterisk@Home)

You'll need to set up two trunks (one as a SIP trunk and one as a custom trunk) and you might need to make some modifications to your extensions.conf (this is to correct a bug in FreePBX).

Step 1:
Add a SIP trunk with these details:

Maximum Channels: 1

Trunk Name: HT-488

PEER Details:
canreinvite=no
context=from-pstn
dtmfmode=rfc2833
host=dynamic
secret=
type=friend

Leave "USER Context", "USER Details", and "Register String" all blank

Step 2:
Add a CUSTOM Trunk with these details:

Maximum Channels: 1
Custom Dial String: SIP/HT-488,,D(w$OUTNUM$)

Step 3:
Modify your extensions.conf as follows:
In the macro-dialout-trunk section, look for the following lines:
exten => s,21,Dial(${pre_num:4}${the_num}${post_num})
exten => s,22,Goto(s-${DIALSTATUS},1)

Replace it with the following lines:
exten => s,21,Set(full_dialstring=${pre_num:4}${the_num}${post_num})
exten => s,22,Set(DialArg1=${CUT(full_dialstring,\,,1)})
exten => s,23,Set(DialArg2=${CUT(full_dialstring,\,,2)})
exten => s,24,Set(DialArg3=${CUT(full_dialstring,\,,3)})
exten => s,25,Dial(${DialArg1},${DialArg2},${DialArg3})
exten => s,26,Goto(s-${DIALSTATUS},1)

Step 4:
In your HT-488's web based configuration, go to the 'BASIC SETTINGS' Section
Set number of rings to answer PSTN line from '4' to '1'
Set "Forward to VoIP" to : s

Step 5:
In your HT-488's web based configuration, go to the 'FXO Port' Section
Enter the login details that you specified in 'PEER Details' in Step 1
Be sure to set your User ID and Auth ID to be 'HT-488'

Step 6:
Use: "SIP/HT-488,,D(w$OUTNUM$)" as your trunk when setting up your outgoing routes.

That should be it, if it doesn't work for you, you may need to tweak it a bit, email me at mervstar@hotmail.com if you need help with the tweaks.