Using Broadvoice, here are my out settings below. Can I get a little help with your interface?
authname=5108030122
canreinvite=no
context=from-pstn
dtmf=inband
dtmfmode=inband
fromdomain=sip.broadvoice.com
fromuser=5108030122
host=sip.broadvoice.com
insecure=very
nat=yes ;toggle if needed
secret=xxxxxxxxxxxxx
type=friend
user=phone
username=5108030122
qualify=no