I have to be honest I didn't remember I posted that....
Anyway that was 1 year ago and in that moment we didn't know how the ITSP was going to give us the SIP Trunk and We also postponed until few weeks ago when the company finally hired the service.
They are giving us the service SIP Trunk over our existing Range IP Wan Internet attached to our FW so I don't know exactly where to place the CUBE. I suppose that the best is to place it in a DMZ with one of the IP of our WAN Internet to have connectivity end to end but that mean I will have to use one IP just for this service.... It's possible to place it in LAN Interface and if its possible which IP should I give to our ITSP? Any other deployment recommendation?
If the SIP service is delivered on your internet connection it is advisable to put the outside interface of the SBC (Cube) on an interface in the firewall and it works best if you use a specific IP address for it. However it’s advisable to work with the admin of the firewall system to verify the proper functionality of the SIP service as it adds complexity to the mix.
Besides from this the answers you got from Chris an me on the other post are still valid.
It seems you've already got the answers here. As mentioned, the two typical choices are CUBE on a new DMZ off your Firewall or the CUBE has an interface to the ITSP equipment.
I've understood that it's the former which is the topology here, so your CUBE would connect to a DMZ port on your Firewall and there would be a 1:1 NAT translating the "DMZ IP" to a spare public IP address configured on your Firewall.
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