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Internet Engineering Task Force (IETF)                       D. Mongrain
Request for Comments: 9806                            Motorola Solutions
Updates: 7866                                                  June 2025
Category: Standards Track                                               
ISSN: 2070-1721

Updates to SIP-Based Media Recording (SIPREC) to Correct Metadata

Media Type

Abstract

The SIP-based Media Recording (SIPREC) protocol is defined by both "Session Initiation Protocol (SIP) Recording Metadata" (RFC 7865) and "Session Recording Protocol" (RFC 7866). Unfortunately, both RFCs contradict each other regarding how recording metadata is to be labeled. In addition, neither RFC registered the new media type. This document updates RFC 7866 to align with RFC 7865 when labeling recording metadata and also registers the media type.

Status of This Memo

This is an Internet Standards Track document.

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). Further information on Internet Standards is available in Section 2 of RFC 7841.

Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at https://www.rfc-editor.org/info/rfc9806.

Copyright Notice

Copyright © 2025 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 (https://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 Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License.

Table of Contents

   1.  Introduction
   2.  Updates to RFC 7866
   3.  Security Considerations
   4.  IANA Considerations
     4.1.  Media Type Registration
   5.  References
     5.1.  Normative References
     5.2.  Informative References
   Acknowledgments
   Author's Address

1. Introduction

The SIP-based Media Recording (SIPREC) protocol is defined by [RFC7865] and [RFC7866]. The former specifies the use of "application/rs-metadata+xml" when identifying metadata content, whereas the latter uses "application/rs-metadata". Since [RFC7865] defines SIPREC metadata, it was identified as normative, and [Err7987] was created against [RFC7866] to report the issue. This document resolves the erratum.

In addition, neither document registered the media type with IANA; this document rectifies this gap.

2. Updates to RFC 7866

Each instance of the following in [RFC7866]: 

   |  application/rs-metadata

Is replaced with: 

   |  application/rs-metadata+xml

3. Security Considerations

The updates specified in this memo clarify inconsistencies in published documents with regard to identifying recording metadata. They do not introduce new security considerations beyond those listed in [RFC7866].

4. IANA Considerations

4.1. Media Type Registration

[RFC7865] defines a media type for use with specifying recording metadata in XML data. This media type is to be used when specifying recording metadata in SIPREC. 

   Type name:  application
   
   Subtype name:  rs-metadata+xml
   
   Required parameters:  N/A
   
   Optional parameters:  N/A
   
   Encoding considerations:  Same as encoding considerations of
      "application/xml" as specified in [RFC7303].
   
   Security considerations:  N/A
   
   Interoperability considerations:  Please note that [RFC7866]
      specifies the use of "application/rs-metadata", which has been
      replaced by "application/rs-metadata+xml" in RFC 9806.
   
   Published specification:  [RFC7865] [RFC9806]
   
   Applications that use this media type:  Session Recording Clients
      (SRCs) and Session Recording Servers (SRSs).
   
   Fragment identifier considerations:  N/A

Additional information: 

      Deprecated alias names for this type:  N/A
      Magic number(s):  N/A
      File extension(s):  N/A
      Macintosh file type code(s):  N/A
   
   Person & email address to contact for further information:  IETF
      SIPCORE Working Group (sipcore@ietf.org)
   
   Intended usage:  COMMON
   
   Restrictions on usage:  There are no restrictions on where this media
      type can be used.
   
   Author:  IETF SIPCORE Working Group (sipcore@ietf.org)
   
   Change controller:  IETF

5. References

5.1. Normative References

   [RFC7303]  Thompson, H. and C. Lilley, "XML Media Types", RFC 7303,
              DOI 10.17487/RFC7303, July 2014,
              <https://www.rfc-editor.org/info/rfc7303>.
   
   [RFC7865]  Ravindranath, R., Ravindran, P., and P. Kyzivat, "Session
              Initiation Protocol (SIP) Recording Metadata", RFC 7865,
              DOI 10.17487/RFC7865, May 2016,
              <https://www.rfc-editor.org/info/rfc7865>.
   
   [RFC7866]  Portman, L., Lum, H., Ed., Eckel, C., Johnston, A., and A.
              Hutton, "Session Recording Protocol", RFC 7866,
              DOI 10.17487/RFC7866, May 2016,
              <https://www.rfc-editor.org/info/rfc7866>.

5.2. Informative References

   [Err7987]  RFC Errata, Erratum ID 7987, RFC 7866,
              <https://www.rfc-editor.org/errata/eid7987>.

Acknowledgments

Thank you to Brian Rosen for his guidance in writing my first Internet-Draft using the new tools and for his thorough review. A sincere thank you to all of the reviewers for their valuable time, which greatly enhanced this document.

Author's Address

   Dan Mongrain
   Motorola Solutions
   Email: Dan.Mongrain@MotorolaSolutions.com