Remote SIP phone connection

I have two network interfaces, one with private IP and one with public IP. My SIP trunk registration goes through private IP to IMS platform and it is OK. But, I want to connect my Softphone app via public IP address. It constantly returns 408 error. I made port forwarding which signal from public IP transfer to private, by adding PREROUTING rules.
PS: I have VPN cloud server with two interfaces

Make sure the register request is reaching the server, because you get sip 408 request timeout when you dont get reply within a specific period of time

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