STUN Extensions for Firewall Traversal

Document Type Expired Internet-Draft (individual)
Authors Tirumaleswar Reddy.K  , Muthu Perumal  , Ram R  , Dan Wing 
Last updated 2013-04-18 (latest revision 2012-10-15)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Some networks deploy firewalls configured to block UDP traffic. When SIP user agents or WebRTC endpoints are deployed behind such firewalls, media cannot be sent over UDP across the firewall, but must be sent using TCP (which causes a different user experience) or through a session border controller. This draft describes an alternate model wherein extensions to ICE connectivity checks can be examined by the firewall to permit outgoing UDP flows across the firewall.


Tirumaleswar Reddy.K (
Muthu Perumal (
Ram R (
Dan Wing (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)