UDP Transport Layer (UDPTL) over Datagram Transport Layer Security (DTLS)
draft-ietf-mmusic-udptl-dtls-06

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Last updated 2014-03-25
Replaces draft-holmberg-mmusic-udptl-dtls, draft-holmberg-dispatch-udptl-dtls
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MMUSIC Working Group                                         C. Holmberg
Internet-Draft                                               I. Sedlacek
Intended status: Standards Track                                Ericsson
Expires: September 26, 2014                                 G. Salgueiro
                                                                   Cisco
                                                          March 25, 2014

   UDP Transport Layer (UDPTL) over Datagram Transport Layer Security
                                 (DTLS)
                    draft-ietf-mmusic-udptl-dtls-06

Abstract

   This document specifies how the UDP Transport Layer (UDPTL) protocol,
   the predominant transport protocol for T.38 fax, can be transported
   over the Datagram Transport Layer Security (DTLS) protocol, how the
   usage of UDPTL over DTLS is indicated in the Session Description
   Protocol (SDP), and how UDPTL over DTLS is negotiated in a session
   established using the Session Initiation Protocol (SIP).

Status of This Memo

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   This Internet-Draft will expire on September 26, 2014.

Copyright Notice

   Copyright (c) 2014 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
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect

Holmberg, et al.       Expires September 26, 2014               [Page 1]
Internet-Draft               UDPTL over DTLS                  March 2014

   to this document.  Code Components extracted from this document must
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Secure Channel  . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  SDP Offerer/Answerer Procedures . . . . . . . . . . . . . . .   5
     4.1.  General . . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.2.  Generating the Initial Offer  . . . . . . . . . . . . . .   6
     4.3.  Generating the Answer . . . . . . . . . . . . . . . . . .   6
     4.4.  Offerer Processing of the Answer  . . . . . . . . . . . .   6
     4.5.  Modifying the Session . . . . . . . . . . . . . . . . . .   7
   5.  Miscellaneous Considerations  . . . . . . . . . . . . . . . .   7
     5.1.  Anonymous Calls . . . . . . . . . . . . . . . . . . . . .   7
     5.2.  NAT Traversal . . . . . . . . . . . . . . . . . . . . . .   7
       5.2.1.  ICE Usage . . . . . . . . . . . . . . . . . . . . . .   7
       5.2.2.  STUN Interaction  . . . . . . . . . . . . . . . . . .   7
     5.3.  Rekeying  . . . . . . . . . . . . . . . . . . . . . . . .   8
     5.4.  Compatibility With UDPTL over UDP . . . . . . . . . . . .   8
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   9.  Change Log  . . . . . . . . . . . . . . . . . . . . . . . . .  10
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  12
     10.2.  Informative References . . . . . . . . . . . . . . . . .  13
   Appendix A.  Examples . . . . . . . . . . . . . . . . . . . . . .  13
     A.1.  General . . . . . . . . . . . . . . . . . . . . . . . . .  13
     A.2.  Basic Message Flow  . . . . . . . . . . . . . . . . . . .  13
     A.3.  Message Flow Of T.38 Fax Replacing Audio Media Stream in
           An Existing Audio-Only Session  . . . . . . . . . . . . .  19
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  23

1.  Introduction

   While it is possible to transmit highly sensitive documents using
   traditional telephony encryption devices, secure fax on the Public
   Switched Telephone Network (PSTN) was never widely considered or
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