This is just a home use for personal or proof of concept setup only. I have a freepbx hosted over the internet with public IP address. My softphones can connect without a problem. I wanted to configure a small SIP gateway, so that I can call PSTN using my phone line at home. Unfortunately, my ISP gave me a private IP address. My small gateway has internet connection and can connect to the freepbx but it is because my ISP NATted my address. I have no control of the NATting, obviously. Is there is any solution to this problem, if so kindly provide link.
Thanks in advance!