Interactive Connectivity Establishment

Interactive Connectivity Establishment (ICE) is a technique used in computer networking involving network address translators (NATs) in Internet applications of Voice over Internet Protocol (VoIP), peer-to-peer communications, video, instant messaging and other interactive media. In such applications, NAT traversal is an important component to facilitate communications involving hosts on private network installations, often located behind firewalls.

ICE is developed by the Internet Engineering Task Force MMUSIC working group and is published as RFC 5245, which has obsoleted RFC 4091.