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Filtering Location Notifications in the Session Initiation Protocol (SIP)
RFC 6447

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 2012

Copyright Notice

   Copyright (c) 2012 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.

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 2012

1.  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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