inbound trunk

[19616]
qualify=yes
nat=yes
context=from-outside
insecure=port,invite
canreinvite=no
language=en_AU
permit=103.26.0.0/255.255.0.0
deny=0.0.0.0/0.0.0.0
secret=xxxxxxxxxxx
username=5716
host=dynamic
dtmfmode=rfc2833
type=user
disallow=all
allow=alaw
allow=ulaw
allow=g722
allow=g729
allow=gsm