Getting SIP through Firewalls and NATs

Document Type Expired Internet-Draft (individual)
Authors Jonathan Rosenberg  , Henning Schulzrinne  , Dale Drew 
Last updated 2000-02-23
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document discusses the interaction of the Session Initiation Protocol (SIP) with with Network Address Translators (NATS) and firewalls. We show the difficulties in SIP traversing these devices, and we compare the solutions that might be used.


Jonathan Rosenberg (
Henning Schulzrinne (
Dale Drew (

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