A Session Initiation Protocol (SIP) Response Code for Rejected Calls
draft-ietf-sipcore-rejected-09

Document Type Active Internet-Draft (sipcore WG)
Last updated 2019-07-24 (latest revision 2019-06-28)
Replaces draft-burger-sipcore-rejected
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SIPCORE                                                        E. Burger
Internet-Draft                                     Georgetown University
Intended status: Standards Track                                B. Nagda
Expires: December 30, 2019         Massachusetts Institute of Technology
                                                           June 28, 2019

  A Session Initiation Protocol (SIP) Response Code for Rejected Calls
                     draft-ietf-sipcore-rejected-09

Abstract

   This document defines the 608 (Rejected) SIP response code.  This
   response code enables calling parties to learn that an intermediary
   rejected their call attempt.  No one will deliver, and thus no one
   will answer, the call.  As a 6xx code, the caller will be aware that
   future attempts to contact the same User Agent Server will likely
   fail.  The initial use case driving the need for the 608 response
   code is when the intermediary is an analytics engine.  In this case,
   the rejection is by a machine or other process.  This contrasts with
   the 607 (Unwanted) SIP response code, which a human at the target
   User Agent Server indicated the user did not want the call.  In some
   jurisdictions this distinction is important.  This document also
   defines the use of the Call-Info header field in 608 responses to
   enable rejected callers to contact entities that blocked their calls
   in error.  This provides a remediation mechanism for legal callers
   that find their calls blocked.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on December 30, 2019.

Burger & Nagda          Expires December 30, 2019               [Page 1]
Internet-Draft    SIP Response Code for Rejected Calls         June 2019

Copyright Notice

   Copyright (c) 2019 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   7
   3.  Protocol Operation  . . . . . . . . . . . . . . . . . . . . .   7
     3.1.  Intermediary Operation  . . . . . . . . . . . . . . . . .   8
     3.2.  JWS Construction  . . . . . . . . . . . . . . . . . . . .   9
       3.2.1.  JOSE Header . . . . . . . . . . . . . . . . . . . . .   9
       3.2.2.  JWT Payload . . . . . . . . . . . . . . . . . . . . .   9
       3.2.3.  JWS Signature . . . . . . . . . . . . . . . . . . . .   9
     3.3.  UAC Operation . . . . . . . . . . . . . . . . . . . . . .   9
     3.4.  Legacy Interoperation . . . . . . . . . . . . . . . . . .  10
     3.5.  Announcement Requirements . . . . . . . . . . . . . . . .  11
   4.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .  12
     4.1.  Full Exchange . . . . . . . . . . . . . . . . . . . . . .  12
     4.2.  Web Site jCard  . . . . . . . . . . . . . . . . . . . . .  15
     4.3.  Multi-modal jCard . . . . . . . . . . . . . . . . . . . .  16
     4.4.  Legacy Interoperability . . . . . . . . . . . . . . . . .  16
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  18
     5.1.  SIP Response Code . . . . . . . . . . . . . . . . . . . .  18
     5.2.  SIP Feature-Capability Indicator  . . . . . . . . . . . .  18
     5.3.  JSON Web Token Claim  . . . . . . . . . . . . . . . . . .  19
     5.4.  Call-Info Purpose . . . . . . . . . . . . . . . . . . . .  19
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  19
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  21
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  22
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  22
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  23
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