nat=yes
externalip=83.67.127.138
localnet=192.168.1.0/255.255.255.0

the above is in sip_nat.conf

# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1               trixbox1.localdomain       trixbox1   localhost.localdomain   localhost
83.67.127.138           sip.rafonline.com trixbox1.localdomain
~

the above is the hosts file