DTLS-SRTP Handling in Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
draft-ietf-straw-b2bua-dtls-srtp-08

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STRAW                                                    R. Ravindranath
Internet-Draft                                                  T. Reddy
Intended status: Standards Track                            G. Salgueiro
Expires: April 21, 2016                                            Cisco
                                                              V. Pascual
                                                                  Quobis
                                                Parthasarathi. Ravindran
                                                          Nokia Networks
                                                        October 19, 2015

  DTLS-SRTP Handling in Session Initiation Protocol (SIP) Back-to-Back
                          User Agents (B2BUAs)
                  draft-ietf-straw-b2bua-dtls-srtp-08

Abstract

   Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
   often act on the media plane, rather than just on the signaling path.
   This document describes the behavior such B2BUAs can adhere to when
   acting on the media plane that uses an Secure Real-time Transport
   (SRTP) security context set up with the Datagram Transport Layer
   Security (DTLS) protocol.

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   This Internet-Draft will expire on April 21, 2016.

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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 April 21, 2016                 [Page 1]
Internet-Draft       DTLS-SRTP Handling in SIP B2BUA        October 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.  RTP/RTCP-aware Media Aware B2BUA  . . . . . . . . . .   6
     3.2.  Media Plane B2BUA with NAT Handling . . . . . . . . . . .   7
   4.  Forking Considerations  . . . . . . . . . . . . . . . . . . .   7
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   9
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

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 the Datagram Transport Layer Security
   (DTLS) [RFC6347] protocol.  It describes a mechanism for transporting
   a certificate fingerprint using Session Description Protocol (SDP)
   [RFC4566].  The fingerprint, identifies the certificate that will be
   presented during the DTLS handshake.  DTLS-SRTP is currently 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 connection (if RTP and RTCP are
   multiplexed) or two DTLS connections (if RTP and RTCP are not
   multiplexed), and either two SRTP contexts (if media traffic is
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