Session Traversal Utilities for NAT (STUN) Message Handling for Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
draft-ietf-straw-b2bua-stun-06

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STRAW                                                  Ram. Ravindranath
Internet-Draft                                                  T. Reddy
Intended status: Standards Track                            G. Salgueiro
Expires: November 15, 2015                                         Cisco
                                                            May 14, 2015

Session Traversal Utilities for NAT (STUN) Message Handling for Session
      Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
                     draft-ietf-straw-b2bua-stun-06

Abstract

   Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
   are often designed to be on the media path, rather than just
   intercepting signaling.  This means that B2BUAs often act on the
   media path leading to separate media legs that the B2BUA correlates
   and bridges together.  When acting on the media path, B2BUAs are
   likely to receive Session Traversal Utilities for NAT (STUN) packets
   as part of Interactive Connectivity Establishment (ICE) processing.

   This document defines behavior for a B2BUA performing ICE processing.
   The goal of this draft is to ensure that B2BUAs properly handles SIP
   messages that carry ICE semantics in Session Description
   Protocol(SDP) and STUN messages received as part of the ICE
   procedures for NAT and Firewall traversal of multimedia sessions.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Internet-Drafts are draft documents valid for a maximum of six months
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on November 15, 2015.

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Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  SDP-Modifying Signaling-only B2BUA  . . . . . . . . . . . . .   5
   4.  Media Plane B2BUAs  . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.2.  Mandatory ICE Termination with B2BUA  . . . . . . . . . .   6
     4.3.  Optional ICE Termination with B2BUA . . . . . . . . . . .   8
     4.4.  STUN Handling in B2BUA with Forked Signaling  . . . . . .  11
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  12
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   In many Session Initiation Protocol (SIP) deployments, SIP entities
   exist in the SIP signaling and media path between the originating and
   final terminating endpoints, which go beyond the definition of a
   traditional SIP proxy.  These SIP entities, commonly known as Back-
   to-Back User Agents (B2BUAs), are described in [RFC7092] and often
   perform functions not defined in Standards Track RFCs.

   SIP [RFC3261], and other session control protocols that try to use
   direct path for media, are typically difficult to use across Network
   Address Translators (NATs).  These protocols use IP addresses and
   transport port numbers encoded in the signaling, such as the Session
   Description Protocol (SDP) [RFC4566] and, in the case of SIP, various

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