I couldn’t find information on this… I was able to get it to work.This is the configuration for an interoffice SIP trunk…adjust values to suite…
Asterisk Business Edition Configuration (2.12)…
Go to Trunks > VOIP Trunks
Provider Name: InterOffice
Hostname: xxxx (IP Address of Trixbox Server)
username: 12000 (Common Account on both sides: Change it to whatever remote office extension you would like)
Codecs: ulaw, alaw, gsm
Go to Options > Advanced Options > Click Show Advanced Options.
Now go to the file editor and go to users.conf Edit the 12000 context to the following
host=x.x.x.x (IP Address of Trixbox)
Create a DialPlan Rule to send for 12xxx extensions over the Interoffice trunk.
Go to trunks
Trunk Name: InterOffice
host=xxxx (IP Address of ABE server)
User context: 12000
Create an Outbound Route for the Trixbox server. In my case i have all traffic going through so i have X.
That should be it.