Hello,
You would need to check your Checkpoint 5400 firewall supported VPN tunnel types (IPsec, PPTP, L2TP, and others), maybe it will support one of the types. Also, Teltonika devices IPsec supports CA authentication. You just need to select X.509 authentication type while configuring IPsec tunnel:
We cannot test it ourselves if it is compatible with your device, but I would recommend double-checking IPsec configuration capabilities of your device.
Regards.