A SIP Response Code for Unwanted Calls
RFC 8197
Document | Type | RFC - Proposed Standard (July 2017; No errata) | |
---|---|---|---|
Author | Henning Schulzrinne | ||
Last updated | 2017-07-13 | ||
Replaces | draft-schulzrinne-dispatch-status-unwanted | ||
Stream | Internent Engineering Task Force (IETF) | ||
Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Adam Roach | ||
Shepherd write-up | Show (last changed 2017-03-02) | ||
IESG | IESG state | RFC 8197 (Proposed Standard) | |
Action Holders |
(None)
|
||
Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Ben Campbell | ||
Send notices to | "Adam Roach" <adam@nostrum.com> | ||
IANA | IANA review state | Version Changed - Review Needed | |
IANA action state | RFC-Ed-Ack |
Internet Engineering Task Force (IETF) H. Schulzrinne Request for Comments: 8197 FCC Category: Standards Track July 2017 ISSN: 2070-1721 A SIP Response Code for Unwanted Calls Abstract This document defines the 607 (Unwanted) SIP response code, allowing called parties to indicate that the call or message was unwanted. SIP entities may use this information to adjust how future calls from this calling party are handled for the called party or more broadly. 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 http://www.rfc-editor.org/info/rfc8197. Copyright Notice Copyright (c) 2017 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 (http://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. Schulzrinne Standards Track [Page 1] RFC 8197 Status Unwanted July 2017 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Normative Language . . . . . . . . . . . . . . . . . . . . . 3 3. Motivation . . . . . . . . . . . . . . . . . . . . . . . . . 3 4. Behavior of SIP Entities . . . . . . . . . . . . . . . . . . 3 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5 5.1. SIP Response Code . . . . . . . . . . . . . . . . . . . . 5 5.2. SIP Global Feature-Capability Indicator . . . . . . . . . 5 6. Security Considerations . . . . . . . . . . . . . . . . . . . 6 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 7 7.1. Normative References . . . . . . . . . . . . . . . . . . 7 7.2. Informative References . . . . . . . . . . . . . . . . . 7 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 8 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 8 1. Introduction In many countries, an increasing number of calls are unwanted [RFC5039]: they might be fraudulent or illegal telemarketing or maybe the receiving party does not want to be disturbed by, say, surveys or solicitation by charities. Carriers and other service providers may want to help their subscribers avoid receiving such calls, using a variety of global or user-specific filtering algorithms. One input into such algorithms is user feedback. User feedback may be offered through smartphone apps, APIs or within the context of a SIP- initiated call. This document addresses feedback within the SIP call. Here, the called party either rejects the SIP [RFC3261] request as unwanted or terminates the session with a BYE request after answering the call. INVITE and MESSAGE requests are most likely to trigger such a response. To allow the called party to express that the call was unwanted, this document defines the 607 (Unwanted) response code. The user agent (UA) of the called party, based on input from the called party or some UA-internal logic, uses this to indicate that this call is unwanted and that future attempts are likely to be similarly rejected. While factors such as identity spoofing and call forwarding may make authoritative identification of the calling party difficult or impossible, the network can use such a rejection -- possibly combined with a pattern of rejections by other callees and/ or other information -- as input to a heuristic algorithm for determining future call treatment. The heuristic processing and possible treatment of persistently unwanted calls are outside the scope of this document. Schulzrinne Standards Track [Page 2] RFC 8197 Status Unwanted July 2017 When this document refers to "caller identity", it uses "identity" in the same sense as [SIP-IDENTITY], i.e., to mean either a canonicalShow full document text