#Remember that you need a valid gateway IPunless the Asterisk server is on the same subnet and LAN
Set Valid Gateway IP (if you don't have one already)
ip route 0.0.0.0 0.0.0.0 GATEWAYIP
Enable VOIPTrust
voice service voip
ip address trusted list
ipv4 0.0.0.0 0.0.0.0
sip
Set Credentials For Asterisk and Register To Asterisk
sip-ua........