bungecord how reverse proxy

[lootoos]

how do I get the server (bushing) to start the first handshake? the server will be the first to connect to the BungeCord.
My goal of the experiment is to bypass the provider's NAT. (Address-)Restricted Cone NAT This type of NAT allows incoming transfers of the assigned source IP address, but allows the use of any source port. As a rule, an incoming rule of this type was previously created dynamically when the local host initiated an outgoing transfer to a remote server (for example, a minecraft server). in order for NAT to allow receiving packets from bungee, it is necessary that the server first starts connecting to BungeCord.
https://doc-kurento.readthedocs.io/en/6.14.0/knowledge/nat.html#address-restricted-cone-nat