Method to establish a peer-to-peer connection between two user agents located behind symmetric NATs

摘要

A method to establish an Internet connection between a first ( 1 ) and a second ( 2 ) user agent is described, wherein a NAT-table entry in a controllable NAT ( 7 ) located in the Internet ( 3 ) is generated, wherein said NAT-table entry comprises public IP-address:Port pairs that are communicated to the user agents ( 1, 2 ), wherein the user agents ( 1, 2 ) use said public IP-address:port pairs for establishing an Internet connection between each other via the controllable NAT ( 7 ).