Negotiating Human Language in Real-Time Communications
RFC 8373

Document Type RFC - Proposed Standard (May 2018; Errata)
Last updated 2018-05-31
Replaces draft-gellens-negotiating-human-language, draft-gellens-slim-negotiating-human-language
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Bernard Aboba
Shepherd write-up Show (last changed 2017-12-07)
IESG IESG state RFC 8373 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Alexey Melnikov
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IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                        R. Gellens
Request for Comments: 8373                    Core Technology Consulting
Category: Standards Track                                       May 2018
ISSN: 2070-1721

         Negotiating Human Language in Real-Time Communications

Abstract

   Users have various human (i.e., natural) language needs, abilities,
   and preferences regarding spoken, written, and signed languages.
   This document defines new Session Description Protocol (SDP) media-
   level attributes so that when establishing interactive communication
   sessions ("calls"), it is possible to negotiate (i.e., communicate
   and match) the caller's language and media needs with the
   capabilities of the called party.  This is especially important for
   emergency calls, because it allows for a call to be handled by a call
   taker capable of communicating with the user or for a translator or
   relay operator to be bridged into the call during setup.  However,
   this also applies to non-emergency calls (for example, calls to a
   company call center).

   This document describes the need as well as a solution that uses new
   SDP media attributes.

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/rfc8373.

Gellens                      Standards Track                    [Page 1]
RFC 8373               Negotiating Human Language               May 2018

Copyright Notice

   Copyright (c) 2018 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 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
     1.1.  Applicability . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Desired Semantics . . . . . . . . . . . . . . . . . . . . . .   5
   4.  The Existing 'lang' Attribute . . . . . . . . . . . . . . . .   5
   5.  Solution  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     5.1.  The 'hlang-send' and 'hlang-recv' Attributes  . . . . . .   5
     5.2.  No Language in Common . . . . . . . . . . . . . . . . . .   7
     5.3.  Usage Notes . . . . . . . . . . . . . . . . . . . . . . .   7
     5.4.  Examples  . . . . . . . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
     6.1.  att-field Subregistry of SDP Parameters . . . . . . . . .  10
     6.2.  Warning Codes Subregistry of SIP Parameters . . . . . . .  11
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   8.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  11
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  12
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  13
   Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  13
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  13

Gellens                      Standards Track                    [Page 2]
RFC 8373               Negotiating Human Language               May 2018

1.  Introduction

   A mutually comprehensible language is helpful for human
   communication.  This document addresses the negotiation of human
   language and media modality (spoken, signed, or written) in real-time
   communications.  A companion document [RFC8255] addresses language
   selection in email.

   Unless the caller and callee know each other or there is contextual
   or out-of-band information from which the language(s) and media
   modalities can be determined, there is a need for spoken, signed, or
   written languages to be negotiated based on the caller's needs and
   the callee's capabilities.  This need applies to both emergency and
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