Verification Involving PSTN Reachability: Requirements and Architecture Overview
draft-jennings-vipr-overview-02

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VIPR WG                                                   M. Barnes, Ed.
Internet-Draft                                                   Polycom
Intended status:  Standards Track                            C. Jennings
Expires:  March 31, 2012                                           Cisco
                                                            J. Rosenberg
                                                             jdrosen.net
                                                       M. Petit-Huguenin
                                                               Stonyfish
                                                      September 28, 2011

Verification Involving PSTN Reachability: Requirements and Architecture
                                Overview
                    draft-jennings-vipr-overview-02

Abstract

   The Session Initiation Protocol (SIP) has seen widespread deployment
   within individual domains, typically supporting voice and video
   communications.  Though it was designed from the outset to support
   inter-domain federation over the public Internet, such federation has
   not materialized.  The primary reasons for this are the complexities
   of inter-domain phone number routing and concerns over security.
   This document reviews this problem space, outlines requirements, and
   then describes a new model and technique for inter-domain federation
   with SIP involving the Public Switched Telephone Network (PSTN),
   called Verification Involving PSTN Reachability (VIPR).  VIPR
   addresses the problems that have prevented inter-domain federation
   over the Internet.  It provides fully distributed inter-domain
   routing for phone numbers, authorized mappings from phone numbers to
   domains, a new technique for automated SIP anti-spam, and privacy of
   number ownership, all while preserving the trapezoidal model of SIP.

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Barnes, Ed., et al.      Expires March 31, 2012                 [Page 1]
Internet-Draft                VIPR Overview               September 2011

   This Internet-Draft will expire on March 31, 2012.

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   Copyright (c) 2011 IETF Trust and the persons identified as the
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Barnes, Ed., et al.      Expires March 31, 2012                 [Page 2]
Internet-Draft                VIPR Overview               September 2011

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Problem Statement  . . . . . . . . . . . . . . . . . . . . . .  4
     2.1.  The Phone Number Routing Problem . . . . . . . . . . . . .  5
     2.2.  The Open Pinhole Problem . . . . . . . . . . . . . . . . .  6
     2.3.  Quality of Service Problem . . . . . . . . . . . . . . . .  7
     2.4.  Troubleshooting Problem  . . . . . . . . . . . . . . . . .  7
   3.  Summary of Existing Solutions  . . . . . . . . . . . . . . . .  7
     3.1.  Domain Routing . . . . . . . . . . . . . . . . . . . . . .  8
     3.2.  Public ENUM  . . . . . . . . . . . . . . . . . . . . . . .  8
     3.3.  Private Federations  . . . . . . . . . . . . . . . . . . .  9
   4.  Key Requirements . . . . . . . . . . . . . . . . . . . . . . .  9
   5.  Executive Overview . . . . . . . . . . . . . . . . . . . . . . 10
     5.1.  Key Properties . . . . . . . . . . . . . . . . . . . . . . 10
     5.2.  Challenging Past Assumptions . . . . . . . . . . . . . . . 12
     5.3.  Technical Overview . . . . . . . . . . . . . . . . . . . . 13
       5.3.1.  Storage of Phone Numbers . . . . . . . . . . . . . . . 14
       5.3.2.  PSTN First Call  . . . . . . . . . . . . . . . . . . . 16
       5.3.3.  Validation and Caching . . . . . . . . . . . . . . . . 17
       5.3.4.  SIP Call . . . . . . . . . . . . . . . . . . . . . . . 20
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