# cat /etc/asterisk/sip.conf
[general]
transport=udp
bindaddr=0.0.0.0
port=8060
externip=x.x.x.x
localnet=172.31.254.0/255.255.255.0
qualify=no
register => 5555555555@"domain:8060":password:username@host:8060/5555555555

[cic]
type=friend
dtmfmode=auto
context=cic
insecure=port,invite
allow=all
host=hostname
port=8060
username=username
fromuser=5555555555
secret=password
canreinvite=no
nat=yes
fromdomain=host:8060