I was just able to place a few outbound calls (via DISA) on my Residential line. I used the outbound trunk settings posted earlier in the thread, copied below:

host=codeblue.voipo.com
username=919249xxxx
secret=(secret, of course)
type=friend
insecure=invite
qualify=yes
nat=yes
port=5060
fromuser=919249xxxx
fromdomain=919249xxxx
context=voipo

I have not played with other settings (that I recall) to significantly change them from the default PBX-in-a-Flash setup. (I recently backed up my Trixbox, then over-wrote with PIAF to see if I like PIAF better.) However, I'll see if I can sanitize and retrieve my entire config files so I can post them.