[vp.thinktel.ca] 
disallow=all 
allow=ulaw 
dtmfmode=rfc2833 
fromdomain=vp.thinktel.ca 
host=159.18.161.67 
username=XXXYYYZZZZ # your SIP authentication number 
secret=@@@@@@@@ # your SIP authentication password 
nat=yes # or nat=no if using publicly accessible IP 
insecure=invite,port 
type=friend 
context=from-trunk

[eico.thinktel.ca] 
disallow=all 
allow=ulaw 
dtmfmode=rfc2833 
fromdomain=eico.thinktel.ca 
host=208.68.17.144 
username=XXXYYYZZZZ # your SIP authentication number 
secret=@@@@@@@@ # your SIP authentication password 
nat=no # eico is public IP only 
insecure=invite,port 
type=friend 
context=from-trunk

[edm.trk.tprm.ca] 
disallow=all 
allow=ulaw 
dtmfmode=rfc2833 
fromdomain=edm.trk.tprm.ca 
host=208.68.17.52 
username=XXXYYYZZZZ # your SIP authentication number 
secret=@@@@@@@@ # your SIP authentication password 
nat=no # or nat=yes if behind NAT 
insecure=invite,port 
type=friend 
context=from-trunk

[tor.trk.tprm.ca] 
disallow=all 
allow=ulaw 
dtmfmode=rfc2833 
fromdomain=tor.trk.tprm.ca 
host=206.80.250.100 
username=XXXYYYZZZZ # your SIP authentication number 
secret=@@@@@@@@ # your SIP authentication password 
nat=no # or nat=yes if behind NAT 
insecure=invite,port 
type=friend 
context=from-trunk

SIP_NAT.conf file must contain these definitions if you are using NAT to ensure proper audio redirection: 
internip=192.168.10.55 # use your PBX internal IP address 
localnet=192.168.10.0/255.255.255.0 # use your internal subnet range 
externip=207.69.25.120 # use your WAN external IP address

SIP.CONF must contain 'srvlookup=yes' in the General context