How Skype works

1. Network Structure: one server controls login, and the rest are node nodes. The nodes with independent public IP addresses are super nodes, while the others are normal nodes. Normal nodes must use super nodes to join the Skype world.

2. Use the stun (Simple Traversal of UDP through NAT) and turn (traversal Using relay Nat) Protocols to detect the NAT and firewall environments.
See application of Private Network traversal Technology in the softswitch system (details)

3. codecs
Global IP sound is dedicated to providing point-to-point voice communication software for Skype on its website: Global IP sound provides voice processing software to Skype's peer-to-peer voice-communications.
The biggest feature is that the audio dynamic range exceeds the normal phone number and can process 50 ~ The sound of Hz is naturally more effective than pstn300 ~ 3400hz is much better, sound more mellow and full

4. encryption technology: AES