SIP server forwarding
I have many SIP servers, but none of them have an external network. Can I use a server with an external network to proxy many SIP servers without an external network
Solution
Yep, you can.
Try using opensips or asterisk as a proxy to redirect calls to nat endpoints. What you’re trying to do is basically how sip providers work
Example: Proxy example
User A is your NAT SIP Servers, Proxy is NAT/External SIP Server and B is PSTN Gateway or PSTN/SIP Provider
In case you have no idea how to get started, here is a useful article, it covers devices but we can consider that devices and servers are endpoints, so the article is for you: Using SIP Devices behind NAT
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