Connecting to SIP Softswitch

Hello Everybody,

I have configured Asterisk and it is working file with VoIPJet…

Now I would like to configure the same with other provider, who is having Softswitch and my IP address is registered with them. I only have IP address of provider. I tried creating SIP Trunks, but seems nothing is happening…

allow=g729&ulaw&alaw
disallow=all
host=17.52.81.12
nat=yes
qualify=yes
type=user

If anyone have done this before…please guide me

Thanks in Advance…