stund

Simple STUN (RFC 3489) server and client

The STUN (Simple Traversal of UDP through NATs (Network Address Translation)) server is an implementation of the STUN protocol that enables STUN functionality in SIP-based systems. The STUN server tar ball also include a client API to enable STUN functionality in SIP endpoints. In addition there is a command line UNIX client and a graphical Windows client that check what type of NAT the user is using. STUN is an application-layer protocol that can determine the public IP and nature of a NAT device that sits between the STUN client and STUN server. The current version of the code supports most of RFC 3489 except the ability to get OTPs from the server.