I don't think this is possible with a hotspot from a cellular connection.
You are behind a nat on cellular, which shares one public IP with many and doesn't allow routable ports/protocols.
The only solution would be to get a public IP address from a home connection or a vps, and setup a VPN to access it from remote.
I could be wrong, but that is my understanding at this point.
Ken
KC2IDB
From: David Harris via 44net <44net@mailman.ampr.org>
Sent: Wednesday, February 8, 2023 10:44:00 PM
To: 44net@mailman.AMPR.org <44net@mailman.AMPR.org>
Subject: [44net] IPIP Tunnel
I am looking for some directions on setting this up with a cellular Hotspot modem.
I am trying to get this to work with a DStar gateway. I have looked at the wiki for the setting up the MikroTik route
Sincerely
David Harris
KE6GAE