IANA Registration of New Session Initiation Protocol (SIP) Resource-Priority Namespace for Mission Critical Push To Talk Service
RFC 8101

Document Type RFC - Informational (March 2017; No errata)
Was draft-holmberg-dispatch-mcptt-rp-namespace (individual in art area)
Last updated 2017-03-22
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Internet Engineering Task Force (IETF)                       C. Holmberg
Request for Comments: 8101                                      J. Axell
Category: Informational                                         Ericsson
ISSN: 2070-1721                                               March 2017

       IANA Registration of New Session Initiation Protocol (SIP)
 Resource-Priority Namespace for Mission Critical Push To Talk Service

Abstract

   This document creates additional Session Initiation Protocol (SIP)
   Resource-Priority namespaces to meet the requirements of the
   3GPP-defined Mission Critical Push To Talk (MCPTT) and places these
   namespaces in the corresponding IANA registry.

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 7841.

   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/rfc8101.

Copyright Notice

   Copyright (c) 2017 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
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   described in the Simplified BSD License.

Holmberg & Axell              Informational                     [Page 1]
RFC 8101                   MCPTT R-P Namespace                March 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Applicability . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  New SIP Resource-Priority Namespaces Created  . . . . . . . .   3
     3.1.  Introduction  . . . . . . . . . . . . . . . . . . . . . .   3
     3.2.  The MCPTT Namespaces  . . . . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The Third Generation Partnership Project (3GPP) has defined a Mission
   Critical Push To Talk (MCPTT) over LTE service [TS.3GPP.22.179].  The
   MCPTT service supports an enhanced Push To Talk (PTT) service that is
   suitable for mission critical scenarios and is based upon 3GPP
   Evolved Packet System (EPS) services.  The requirements for the MCPTT
   service defined within 3GPP can also form the basis for other PTT
   services.

   The MCPTT service is intended to support communication between
   several users (a group call), where each user can gain permission to
   talk in an arbitrated manner.  However, the MCPTT service also
   supports private calls between pairs of users.

   MCPTT is primarily targeted to provide a professional PTT service to,
   e.g., public safety, transport companies, utilities, and industrial
   and nuclear plants.  In addition to this, a commercial PTT service
   for non-professional use (e.g., groups of people on holiday) may be
   delivered through an MCPTT system.  Based on their operational model,
   the performance and MCPTT features in use vary per user organization,
   where functionality that is more mission-critical-specific (e.g.,
   Imminent Peril Call) might not be available to commercial customers.

   The MCPTT service provides its users with different priorities for
   the access to network resources in order to provide means to
   prioritize between calls when resources are scarce.  Among other
   things, these priorities take into account the priority and role of
   the caller, the priority and type of the group, and the situation in
   which the call is made.

   The SIP-level call control procedures using these namespaces are
   specified in [TS.3GPP.24.379].  The namespaces defined here will
   support a wide range of queuing options.  The namespaces correspond
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