Location Conveyance for the Session Initiation Protocol
RFC 6442

Internet Engineering Task Force (IETF)                           J. Polk
Request for Comments: 6442                                 Cisco Systems
Category: Standards Track                                       B. Rosen
ISSN: 2070-1721                                              J. Peterson
                                                                 NeuStar
                                                           December 2011

        Location Conveyance for the Session Initiation Protocol

Abstract

   This document defines an extension to the Session Initiation Protocol
   (SIP) to convey geographic location information from one SIP entity
   to another SIP entity.  The SIP extension covers end-to-end
   conveyance as well as location-based routing, where SIP
   intermediaries make routing decisions based upon the location of the
   Location Target.

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/rfc6442.

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   Copyright (c) 2011 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   described in the Simplified BSD License.

Polk, et al.                 Standards Track                    [Page 1]
RFC 6442               Location Conveyance in SIP          December 2011

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   than English.

Table of Contents

   1. Introduction ....................................................3
   2. Conventions and Terminology Used in This Document ...............4
   3. Overview of SIP Location Conveyance .............................4
      3.1. Location Conveyed by Value .................................4
      3.2. Location Conveyed as a Location URI ........................5
      3.3. Location Conveyed though a SIP Intermediary ................6
      3.4. SIP Intermediary Replacing Bad Location ....................7
   4. SIP Extensions for Geolocation Conveyance .......................8
      4.1. The Geolocation Header Field ...............................8
      4.2. The Geolocation-Routing Header Field ......................11
           4.2.1. Explaining Geolocation-Routing Header-Value
                  States .............................................12
      4.3. 424 (Bad Location Information) Response Code ..............14
      4.4. The Geolocation-Error Header Field ........................15
      4.5. Location URIs in Message Bodies ...........................19
      4.6. Location Profile Negotiation ..............................19
   5. Geolocation Examples ...........................................20
      5.1. Location-by-Value (in Coordinate Format) ..................20
      5.2. Two Locations Composed in Same Location Object Example ....21
   6. Geopriv Privacy Considerations .................................23
   7. Security Considerations ........................................24
   8. IANA Considerations ............................................26
      8.1. IANA Registration for the SIP Geolocation Header Field ....26
      8.2. IANA Registration for the SIP Geolocation-Routing
           Header Field ..............................................26
      8.3. IANA Registration for Location Profiles ...................27