Internet Engineering Task Force (IETF) R. Mahy
Request for Comments: 6447 Individual
Category: Standards Track B. Rosen
ISSN: 2070-1721 NeuStar
H. Tschofenig
Nokia Siemens Networks
January 2012
Filtering Location Notifications in
the Session Initiation Protocol (SIP)
Abstract
This document describes filters that limit asynchronous location
notifications to compelling events. These filters are designed as an
extension to RFC 4661, an XML-based format for event notification
filtering, and based on RFC 3856, the SIP presence event package.
The resulting location information is conveyed in existing location
formats wrapped in the Presence Information Data Format Location
Object (PIDF-LO).
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 5741.
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/rfc6447.
Mahy, et al. Standards Track [Page 1]RFC 6447 Location Filters January 2012Copyright Notice
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Filter Definitions . . . . . . . . . . . . . . . . . . . . . . 4
3.1. Movement . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.2. Speed Changes . . . . . . . . . . . . . . . . . . . . . . 5
3.3. Element Value Changes . . . . . . . . . . . . . . . . . . 5
3.4. Entering or Exiting a Region . . . . . . . . . . . . . . . 8
3.5. Location Type . . . . . . . . . . . . . . . . . . . . . . 10
3.6. Rate Control . . . . . . . . . . . . . . . . . . . . . . . 12
4. XML Schema . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5. Security Considerations . . . . . . . . . . . . . . . . . . . 15
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 16
6.1. URN Sub-Namespace Registration for
urn:ietf:params:xml:ns:location-filter . . . . . . . . . . 16
6.2. Schema Registration for location-filter . . . . . . . . . 16
7. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 17
8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 17
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 17
9.1. Normative References . . . . . . . . . . . . . . . . . . . 17
9.2. Informative References . . . . . . . . . . . . . . . . . . 18
Mahy, et al. Standards Track [Page 2]RFC 6447 Location Filters January 20121. Introduction
Conveying location information encapsulated with a Presence
Information Data Format Location Object (PIDF-LO) [RFC4119] document
within SIP is described in [SIP-LOC]. An alternative signaling
approach to location conveyance, which uses asynchronous
communication, is available with the SIP event notification
mechanisms (see RFC 3265 [RFC3265]). This approach conveys location
information in PIDF-LO format using the presence event package
[RFC3856]. This document focuses on the event notification paradigm.
Determining when to send event notifications with location
information is technically more challenging than deciding when to
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