The GLib ICE implementation

Libnice is an implementation of the IETF's draft Interactice
Connectivity Establishment standard (ICE). It provides GLib-based library,
libnice and GStreamer elements.

ICE is useful for applications that want to establish peer-to-peer UDP
data streams. It automates the process of traversing NATs and provides
security against some attacks.

Existing standards that use ICE include Session Initiation Protocol
(SIP) and XMPP Jingle.