3CX Server on GCP Cloud, phones behind ISP NAT

[edokim22]

I am trying to set up an phones at an additional site to an existing and working 3CX hosted on GCP Cloud. I configured the phones, and outbound calls work fine. However, cannot get inbound calls because the phones are behind an ISP NAT. The new site is in Mexico and the ISP does not currently have public IPs available.

I will appreciate feedback on solving this.

Thank you,

Ed

 

[SweetAction]

Install a SBC. You have to solve NAT somehow and if you are being double natted that's the fastest supported way to do so.

 

[JohnS_3CX]

We have a solution for your problem: https://www.3cx.com/docs/3cx-tunnel-session-border-controller/

Give it a try and see how it goes.

 

[edokim22]

Thank you both for the feedback. We will try it, and come back with results.

 

[SweetAction]

Thank you both for the feedback. We will try it, and come back with results.

To be clear my solution is the same as John's - use the 3CX SBC as it's designed to solve this issue.