SIP Call-Info Parameters for Labeling Calls
draft-ietf-sipcore-callinfo-spam-03
SIPCORE H. Schulzrinne
Internet-Draft Columbia University
Intended status: Standards Track June 7, 2018
Expires: December 9, 2018
SIP Call-Info Parameters for Labeling Calls
draft-ietf-sipcore-callinfo-spam-03
Abstract
Called parties often wish to decide whether to accept, reject or
redirect calls based on the likely nature of the call. For example,
they may want to reject unwanted telemarketing or fraudulent calls,
but accept emergency alerts from numbers not in their address book.
This document describes SIP Call-Info parameters and a feature tag
that allow originating, intermediate and terminating SIP entities to
label calls as to their type, confidence and references to additional
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
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on December 9, 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
Schulzrinne Expires December 9, 2018 [Page 1]
Internet-Draft Call-Info Spam June 2018
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 . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Normative Language . . . . . . . . . . . . . . . . . . . . . 3
3. Overview of Operation . . . . . . . . . . . . . . . . . . . . 3
4. Parameters . . . . . . . . . . . . . . . . . . . . . . . . . 4
5. Call Types . . . . . . . . . . . . . . . . . . . . . . . . . 5
6. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6.1. REGISTER Response . . . . . . . . . . . . . . . . . . . . 6
6.2. INVITE Request . . . . . . . . . . . . . . . . . . . . . 7
7. ABNF . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
8.1. SIP Call-Info Header Field Parameters . . . . . . . . . . 7
8.2. SIP Global Feature-Capability Indicator . . . . . . . . . 7
8.3. SIP Call-Info Type Parameter . . . . . . . . . . . . . . 8
9. Security Considerations . . . . . . . . . . . . . . . . . . . 8
10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 8
11. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
11.1. Normative References . . . . . . . . . . . . . . . . . . 8
11.2. Informative References . . . . . . . . . . . . . . . . . 9
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 9
1. Introduction
In many countries, an increasing number of calls are unwanted
[RFC5039], as they might be fraudulent, telemarketing or the
receiving party does not want to be disturbed by, say, surveys or
solicitation by charities. Currently, called parties have to rely
exclusively on the caller's number or, if provided, caller name, but
unwanted callers may not provide their true name or use a name that
misleads, e.g., "Cardholder Services". On the other hand, many calls
from unknown numbers may be important to the called party, whether
this is an emergency alert from their emergency management office or
a reminder about a doctor's appointment. Since many subscribers now
reject all calls from unknown numbers, such calls may also
inadvertently be left unanswered. Users may also install smartphone
apps that can benefit from additional information in making decisions
as to whether to ring, reject or redirect a call to voicemail.
To allow called parties to make more informed decisions on how to
handle incoming calls from unknown callers, we describe a new set of
parameters for the SIP [RFC3261] Call-Info header field for labeling
Show full document text