DTLS-SRTP Handling in Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
draft-ietf-straw-b2bua-dtls-srtp-03

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STRAW                                                    R. Ravindranath
Internet-Draft                                                  T. Reddy
Intended status: Standards Track                            G. Salgueiro
Expires: December 20, 2015                                         Cisco
                                                              V. Pascual
                                                                  Quobis
                                                Parthasarathi. Ravindran
                                                          Nokia Networks
                                                           June 18, 2015

  DTLS-SRTP Handling in Session Initiation Protocol (SIP) Back-to-Back
                          User Agents (B2BUAs)
                  draft-ietf-straw-b2bua-dtls-srtp-03

Abstract

   Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
   often function on the media plane, rather than just on the signaling
   path.  This document describes the behavior B2BUAs should follow when
   acting on the media plane that use Secure Real-time Transport (SRTP)
   security context setup with Datagram Transport Layer Security (DTLS)
   protocol.

Status of This Memo

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   This Internet-Draft will expire on December 20, 2015.

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   Copyright (c) 2015 IETF Trust and the persons identified as the
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   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents

Ravindranath, et al.    Expires December 20, 2015               [Page 1]
Internet-Draft       DTLS-SRTP handling in SIP B2BUA           June 2015

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.2.  Goals . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Media Plane B2BUA handling of DTLS-SRTP . . . . . . . . . . .   4
     3.1.  General . . . . . . . . . . . . . . . . . . . . . . . . .   4
       3.1.1.  Media Relay . . . . . . . . . . . . . . . . . . . . .   4
       3.1.2.  Media Aware Relay . . . . . . . . . . . . . . . . . .   6
     3.2.  Media Plane B2BUA with NAT handling . . . . . . . . . . .   7
   4.  Forking . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   8
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   8
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

1.1.  Overview

   [RFC5763] describes how Session Initiation Protocol (SIP) [RFC3261]
   can be used to establish a Secure Real-time Transport Protocol (SRTP)
   [RFC3711] security context with Datagram Transport Layer Security
   (DTLS) [RFC6347] protocol.  It describes a mechanism of transporting
   a certificate fingerprint in the Session Description Protocol (SDP)
   [RFC4566], which identifies the certificate that will be presented
   during the DTLS handshake.  DTLS-SRTP is defined for point-to-point
   media sessions, in which there are exactly two participants.  Each
   DTLS-SRTP session (described in section 3 of [RFC5764]) contains a
   single DTLS association, and either two SRTP contexts (if media
   traffic is flowing in both directions on the same 5-tuple) or one
   SRTP context (if media traffic is only flowing in one direction).

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