At present in the Android platform, need to do a simple instant messaging software, voice and file transfer is certainly need P2P communication directly, this would require the NAT penetration, because the actual use of 3 g/4 g networks, check information, said three-quarters of g is located behind a NAT, that is, network address, port + outside the web address, port, but most of the operators type is a symmetric NAT NAT equipment, which is difficult to penetrate NAT, I ask this kind of case do you have any plan to solve this problem, thank you

CodePudding user response:

I currently do NAT penetration scheme based on udp, but there is no good method, port prediction efficiency is too low