Session Initiation Protocol (SIP) Call Flow Examples with PASSporT Diversion and History-Info
draft-barnes-stir-passport-div-hi-callflows-01
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STIR M. Barnes
Internet-Draft iconectiv
Intended status: Informational July 01, 2018
Expires: January 2, 2019
Session Initiation Protocol (SIP) Call Flow Examples with PASSporT
Diversion and History-Info
draft-barnes-stir-passport-div-hi-callflows-01
Abstract
This document focuses on use cases and call flows which include the
History-Info header field and a SIP Identity header field with a
PASSport with a "div" claim in cases of retargeting. These use cases
are derived from those provided in the SIP History-Info call flows
document. The objective is to describe the optimal way to correlate
the History-Info header fields with a PASSporT with diversion
information to increase the level of confidence in the History-Info
header field by the terminating entity making use of the information.
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
Task Force (IETF). Note that other groups may also distribute
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This Internet-Draft will expire on January 2, 2019.
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
Barnes Expires January 2, 2019 [Page 1]
Internet-DrafPASSporT Diversion and History-Info Call Flows July 2018
to this document. Code Components extracted from this document must
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Table of Contents
1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions and Terminology . . . . . . . . . . . . . . . . . 2
3. Detailed call flows . . . . . . . . . . . . . . . . . . . . . 3
3.1. PBX Voicemail Example . . . . . . . . . . . . . . . . . . 3
3.2. Consumer Voicemail Example . . . . . . . . . . . . . . . 10
4. Security Considerations . . . . . . . . . . . . . . . . . . . 15
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15
5.1. Acknowledgements . . . . . . . . . . . . . . . . . . . . 15
6. Informative References . . . . . . . . . . . . . . . . . . . 16
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 16
1. Overview
Many services that use SIP require the ability to determine why and
how the call arrived at a specific application. The use cases
provided in [RFC7131] illustrate the use of the History-Info header
field [RFC7044] for example applications and common scenarios. The
document [I-D.ietf-stir-passport-divert] extends the PASSporT,
defined in [RFC8225] to cryptographically-sign the calling party
information, to include an indication that a call has been diverted
from its original destination to a new one. This document discusses
the applicability and use of this PASSporT extension for diverted
calls in the context of scenarios for which use of the History-Info
header field is essential for processing by the terminating entity.
Descriptions of the example use cases, call flow diagrams and
messaging details including both History-Info header field and a SIP
Identity header field with a PASSport capturing the retargeted
identity are provided.
2. Conventions and Terminology
The term "retarget" is used as defined in [RFC7044]. The term
"divert" refers to a specific type of retargeting and is used per the
context in [I-D.ietf-stir-passport-divert]. The terms "location
service", "redirect" and "address-of-record (AOR)" are used
consistent with the terminology in [RFC3261].
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3. Detailed call flows
The scenarios in this section provide sample use cases for the
History-Info header along with a PASSporT(s) containing the
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