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An Architecture for Media Recording Using the Session Initiation Protocol
RFC 7245

Internet Engineering Task Force (IETF)                    A. Hutton, Ed.
Request for Comments: 7245                                         Unify
Category: Informational                                  L. Portman, Ed.
ISSN: 2070-1721                                             NICE Systems
                                                                 R. Jain
                                                             IPC Systems
                                                                K. Rehor
                                                     Cisco Systems, Inc.
                                                                May 2014

                  An Architecture for Media Recording
                 Using the Session Initiation Protocol

Abstract

   Session recording is a critical requirement in many communications
   environments such as call centers and financial trading.  In some of
   these environments, all calls must be recorded for regulatory,
   compliance, and consumer protection reasons.  Recording of a session
   is typically performed by sending a copy of a media stream to a
   recording device.  This document describes architectures for
   deploying session recording solutions in an environment that is based
   on the Session Initiation Protocol (SIP).

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7245.

Hutton, et al.                Informational                     [Page 1]
RFC 7245            Architecture for Media Recording            May 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
   Provisions Relating to IETF Documents
   (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
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Session Recording Architecture  . . . . . . . . . . . . . . .   5
     3.1.  Location of the SRC . . . . . . . . . . . . . . . . . . .   5
       3.1.1.  B2BUA Acts as a SRC . . . . . . . . . . . . . . . . .   5
       3.1.2.  Endpoint Acts as SRC  . . . . . . . . . . . . . . . .   6
       3.1.3.  A SIP Proxy Cannot Be a SRC . . . . . . . . . . . . .   7
       3.1.4.  Interaction with MEDIACTRL  . . . . . . . . . . . . .   7
       3.1.5.  Interaction with Conference Focus . . . . . . . . . .   9
     3.2.  Establishing the Recording Session  . . . . . . . . . . .  10
       3.2.1.  SRC-Initiated Recording . . . . . . . . . . . . . . .  11
       3.2.2.  SRS-Initiated Recording . . . . . . . . . . . . . . .  11
       3.2.3.  Pause/Resume Recording Session  . . . . . . . . . . .  12
       3.2.4.  Media Stream Mixing . . . . . . . . . . . . . . . . .  12
       3.2.5.  Media Transcoding . . . . . . . . . . . . . . . . . .  12
       3.2.6.  Lossless Recording  . . . . . . . . . . . . . . . . .  12
     3.3.  Recording Metadata  . . . . . . . . . . . . . . . . . . .  13
       3.3.1.  Contents of Recording Metadata  . . . . . . . . . . .  13
       3.3.2.  Mechanisms for Delivery of Metadata to SRS  . . . . .  13
     3.4.  Notifications to the Recorded User Agents . . . . . . . .  13
     3.5.  Preventing the Recording of a SIP Session . . . . . . . .  13
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  15
   7.  Informative References  . . . . . . . . . . . . . . . . . . .  15

Hutton, et al.                Informational                     [Page 2]
RFC 7245            Architecture for Media Recording            May 2014

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