Juniper 5gt SIP configuration example

hope this might help.

Solution From Juniper Forum

The setup will depend on where the VOIP server sits. Is the server and phones going to be behind the firewall? Or is the server going to be outside the firewall and the phones inside?

I'm not sure yet.  The customer is getting that info for me.  In the meanwhile I have put a config on the firewall to ship it to them.  I can continue configuration once it is in place.  Would you mind looking at the config and let me know if I'm missing anything?  I'm concerned about the default route as I'm used to Cisco cli and this is quite different.
voice-fw-config.docx

Since this appears to be at least screenOS 6.x or newer the following statement in your config should be sufficient

set interface ethernet 0/0 gateway 63.x.x.x

But since you said you are sending the device to a client, just to be safe you can (from the webui) add the default route under Network > Routing > Destination, or from the command line using the following command

set route 0.0.0.0/0 interface ethernet0/0 gateway 63.x.x.x
save

Thanks.  The phone server is outside of the customer network at a place called Next Level.  Does this help?

Yes that is very important. With the VoIP server residing off site, what you want to do is:

A) disable sip ALG
B) enable 'source based NAT' in the advanced properties of the trust to untrust policy. You can get to properties for a policy by clicking on the edit link for the policy in question.

I will look up the correct CLI commands to enter and post them if you only have console access.

That would be terrific.  Please provide the cli commands.  Thank you.

Thanks.  The FW is going in today and I will try your suggestions.