Are there any ways to establish a p2p connections among peers behind Carrier-grade NATs? Do I have to use a middle server to initiate the connection? Are there any other ways? How BitTorrent do establish a p2p connection in such a situation?
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Do I have to use a middle server to initiate the connection?
You don't need a server, any mutually reachable peer in a p2p network can act as rendezvous.
Are there any ways to establish a p2p connections among peers behind Carrier-grade NATs?
If the CGNAT uses Endpoint-Independent Mappings (EIM) as suggested by RFC 6888 and others then regular NAT traversal techniques apply.
Are there any other ways?
Some home routers support nat-pmp/pcp and forward that to the cgnat.
How BitTorrent do establish a p2p connection in such a situation?
See my answer on How NAT traversal works in case of peer to peer protocols like bittorrent.
