SIP Call-Info Parameters for Labeling Calls
draft-ietf-sipcore-callinfo-spam-01
SIPCORE H. Schulzrinne
Internet-Draft FCC
Intended status: Standards Track July 17, 2017
Expires: January 18, 2018
SIP Call-Info Parameters for Labeling Calls
draft-ietf-sipcore-callinfo-spam-01
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, spam probability and references to
additional information.
Status of This Memo
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on January 18, 2018.
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Schulzrinne Expires January 18, 2018 [Page 1]
Internet-Draft Call-Info Spam July 2017
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Normative Language . . . . . . . . . . . . . . . . . . . . . 3
3. Overview of Operation . . . . . . . . . . . . . . . . . . . . 3
4. Parameters . . . . . . . . . . . . . . . . . . . . . . . . . 4
5. Call Types . . . . . . . . . . . . . . . . . . . . . . . . . 4
6. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6.1. REGISTER Response . . . . . . . . . . . . . . . . . . . . 6
6.2. INVITE Request . . . . . . . . . . . . . . . . . . . . . 6
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 be
inadvertently be left unanswered. Users may also install smartphone
apps that can benefit from additional information in making decisions
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