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Check the Pi's own uptime to ensure it doesn't reboot. Before troubleshooting why the phone does not show up, its important that the SBC stays stable.
If the TLS connection keeps dropping then something is "breaking" the TLS connection on your firewall perhaps since the handshake fails. Or possibly its just a bad physical connection (anywhere in the chain)? UDP will be more tolerant, but you lose TLS effectively. On a good connection TLS is very stable.
Once all is set and done, resetting the phone should make it appear as a new phone. If not, then at that point you will need to look at multicast, since this is how the phone reports its presence to the SBC (and then to the PBX).
If the TLS connection keeps dropping then something is "breaking" the TLS connection on your firewall perhaps since the handshake fails. Or possibly its just a bad physical connection (anywhere in the chain)? UDP will be more tolerant, but you lose TLS effectively. On a good connection TLS is very stable.
Once all is set and done, resetting the phone should make it appear as a new phone. If not, then at that point you will need to look at multicast, since this is how the phone reports its presence to the SBC (and then to the PBX).
