RFC 3523 (rfc3523) - Page 2 of 6

Internet Emergency Preparedness (IEPREP) Telephony Topology Terminology

RFC 3523                        IEPREP                        April 2003


1.  Introduction

   This document defines the topology naming conventions that are to be
   used in reference to IEPREP phone calls.  These naming conventions
   should be used to focus the IEPREP Working Group (WG) during
   discussions and  when writing requirements, gap analysis and other
   solutions documents.

   There has been much confusion on the IEPREP list as well as within
   each meeting about the topologies IEPREP is considering.  Hopefully
   this document will give each reader and author a reference set of
   named architectures.

   This memo attempts to be agnostic with regard to IP signaling or
   control protocols (SIP, MEGACO, etc), as well as any underlying
   Quality of Service (QOS) mechanisms (Diffserv, RSVP, NSIS, etc).

1.1 Motivation

   Simply put, to get everyone referencing the same (named) topologies
   in order to have useful and less confusing dialog to further this
   working group's efforts.

1.2 Terms and Definitions

   The following acronyms need to be exploded for clarity:

      CSN = Circuit Switched Network

      GW  = Gateway (CSN to IP, or IP to CSN)

2.  IEPREP Topologies

   There are 4 often mentioned, but very little documented topologies
   discussed within this WG's efforts so far.  The following subsections
   name and describe each of the topologies.

   The 4 topologies are (quickly):

      Topology "IP Bridging"

      Topology "IP at the Start"

      Topology "IP at the End"

      Topology "End-to-End IP"





Polk                         Informational