Hi :-)
I would suggest you have a look again in your sip.conf
The general section should contain a register clause:
register => user:password@provider:506
0
nd then the trunk as a peer. Here is a sample that works with FWD
Note that for some purposes "fromuser" works and for others "username" does.
[trunk_6]
context=incoming
type=peer
callerid=asreceived
disallow=all
allow=ulaw
host=
port=5060
canreinvite=no
insecure=very
dtmfmode=rfc2833
nat=yes
fromuser=username
username=username
fromdomain=
secret=secret
Hope it helps...