sip.conf:

[general]
context=default
srvlookup=yes
videosupport=yes
externhost=svartalfheim.homeunix.net
externrefresh=10
localnet=192.168.0.0/255.255.0.0

[1001] ;IPKall
type=friend
dtmfmode=rfc2833
context=incoming
host=66.54.140.46
tos=reliability
insecure=very
nat=yes
canreinvite=no

rtp.conf:

[general]
rtpstart=10000
rtpend=10500