DTLS-SRTP Handling in Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
draft-ietf-straw-b2bua-dtls-srtp-11

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STRAW                                                    R. Ravindranath
Internet-Draft                                                  T. Reddy
Intended status: Standards Track                            G. Salgueiro
Expires: September 8, 2016                                         Cisco
                                                              V. Pascual
                                                                  Quobis
                                                Parthasarathi. Ravindran
                                                          Nokia Networks
                                                           March 7, 2016

  DTLS-SRTP Handling in Session Initiation Protocol (SIP) Back-to-Back
                          User Agents (B2BUAs)
                  draft-ietf-straw-b2bua-dtls-srtp-11

Abstract

   Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUA)
   exist on the signaling and media paths between the endpoints.  This
   document describes the behavior of B2BUAs when Secure Real-time
   Transport (SRTP) security context is set up with the Datagram
   Transport Layer Security (DTLS) protocol.

Status of This Memo

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

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   This Internet-Draft will expire on September 8, 2016.

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   Copyright (c) 2016 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
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   (http://trustee.ietf.org/license-info) in effect on the date of

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Internet-Draft       DTLS-SRTP Handling in SIP B2BUA          March 2016

   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.2.  Goals and Scope of this Document  . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  B2BUAs Procedures to Allow End-to-End DTLS-SRTP . . . . . . .   4
   4.  Signaling Plane B2BUA Handling of DTLS-SRTP . . . . . . . . .   5
     4.1.  Proxy-B2BUAs  . . . . . . . . . . . . . . . . . . . . . .   5
     4.2.  Signaling-only and SDP-modifying Signaling-only B2BUAs  .   5
   5.  Media Plane B2BUA Handling of DTLS-SRTP . . . . . . . . . . .   6
     5.1.  General . . . . . . . . . . . . . . . . . . . . . . . . .   6
       5.1.1.  Media Relay . . . . . . . . . . . . . . . . . . . . .   6
       5.1.2.  RTP/RTCP-Aware Media-Aware B2BUA  . . . . . . . . . .   8
   6.  Forking Considerations  . . . . . . . . . . . . . . . . . . .   9
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  10
   10. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  10
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  11
     11.2.  Informative References . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

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
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