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H.323 NAT Traversal Problem particular to H.323(RAS->Q.931->H.245): RAS from private network to public network can pass NAT Q931?H.245 adopts the TCP, if Q.931 is initialized from public network (such as from GK) Cannot initialize a TCP connection from outside to a terminal inside a private network SYN packet cannot pass the NAT device TE in private network TE in public network NAT SYN SYN+ACK ACK B A X TCP SYN packet TCP utilizes three way handshake, it has direction. NAT TE TE |