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Location Hiding: Problem Statement and Requirements

The emergency services architecture developed in the IETF Emergency
Context Resolution with Internet Technology (ECRIT) working group
describes an architecture where location information is provided by
access networks to end points or VoIP service providers in order to
determine the correct dial string and information to route the call to
a Public Safety Answering Point (PSAP). For determining the PSAP
Uniform Resource Identifier (URI) the usage of the Location-to-
Service Translation (LoST) Protocol is envisioned. This document
provides a problem statement and lists requirements for situations
where the Internet Access Provider (IAP) and/or the Internet Service
Provider (ISP) are only willing to disclose limited or no location
information.