Below is my Time Warner Asterisk SIP trunk configuration. Time Warner uses IP authentication and will install a local voice gateway on your network. On my network the voice gateway is set to 192.168.1.80. You do not need a registration string.

host=192.168.1.80
type=friend
insecure=very
port=5060
context=from-pstn
dtmfmode=auto
nat=yes
canreinvite=yes
qualify=yes
allow=all

 

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