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Vipr Status Pages

Verification Involving PSTN Reachability (Concluded WG)
Rai Area: Alissa Cooper, Ben Campbell | 2011-Mar-27 — 2014-Jan-24 

2013-07-23 charter

Verification Involving PSTN Reachability (vipr)


 Current Status: Active

     Jon Peterson <jon.peterson@neustar.biz>
     Daryl Malas <d.malas@cablelabs.com>

 Real-time Applications and Infrastructure Area Directors:
     Richard Barnes <rlb@ipv.sx>
     Gonzalo Camarillo <gonzalo.camarillo@ericsson.com>

 Real-time Applications and Infrastructure Area Advisor:
     Richard Barnes <rlb@ipv.sx>

 Mailing Lists:
     General Discussion: vipr@ietf.org
     To Subscribe:       https://www.ietf.org/mailman/listinfo/vipr
     Archive:            http://www.ietf.org/mail-archive/web/vipr/

Description of Working Group:

    There are two globally deployed address spaces for communications used
    by more than a billion people daily - phone numbers and DNS rooted
    address such as web servers and email addresses.  The inter-domain
    signaling design of SIP is primarily designed for email style addresses
    yet a large percentage of SIP deployments mostly use phone numbers for
    identifying users, thus DNS lookups are not sufficient.  The goal of
    this working group is to enable inter-domain communications over the
    Internet, using protocols such as SIP, while still allowing people to
    use phone numbers to identify the person with whom they wish to

    The VIPR WG will develop a peer to peer based approach to finding
    domains that claim to be responsible for a given phone number
    to mitigate the involvement of centralized entities to avoid some of
    the issues encountered by past attempts to support SIP inter-domain
    communications.  Validation protocols will be developed to ensure a
    reasonable likelihood that a given domain actually is responsible for
    the phone number.  In this context, "responsible" means an
    administrative domain, which is at least one of the domains, to which
    a PSTN call to this phone number would be routed.  Once the domain
    responsible for the phone number is found, existing protocols, such
    as SIP, can be used for inter-domain communications.

    Some validation protocols may be based on knowledge gathered around a
    PSTN call; for example, the ability to prove a call was received over
    the PSTN based on start and stop times.  Other validation schemes, such
    as examining fingerprints or watermarking of PSTN media to show that a
    domain received a particular PSTN phone call, may also be considered by
    the working group.  This validation will be accomplished using publicly
    available open interfaces to the PSTN, so the validation can be
    performed by any domain wishing to participate.  The WG will select and
    standardize at least one validation scheme.

    The validation mechanism requires a domain to gather and maintain
    information related to PSTN calls.  This information is used by call
    agents such as phones, SBCs and IP PBXs to route calls.  The WG will
    also develop mechanisms to detect in a timely manner that a given domain
    is no longer responsible for a phone number.  The WG will define a
    client-server protocol between these call agents and the entity within a
    domain that maintains the information.

    To help mitigate SPAM issues when using SIP between domains, the WG will
    define a mechanism to enable one domain to check that incoming SIP
    messages are coming from a validated phone number.  A phone number is
    considered validated if it is coming from a domain to which the calling
    domain had previously successfully placed a PSTN call.  The working
    group will define new SIP headers and option tags, as necessary, to
    enable this.

    The essential characteristic of VIPR is establishing authentication by
    PSTN reachability when it is not possible to use a direct reference to
    ENUM databases or other direct assertions of PSTN number
    ownership.  Elements such as public ENUM easily coexist with VIPR but no
    direct interaction with ENUM will be required.  The solution set defined
    by this WG will be incrementally deployable using only existing
    interfaces to the PSTN.  No changes will be required to existing PSTN
    capabilities, no new database access is needed nor is any new support
    from PSTN service providers required.

    The WG will produce the following deliverables:

    1) A document describing the requirements, problem statement and
    architectural approach to support SIP inter-domain communications.
    2) A document describing the use of the p2psip protocol (RELOAD) as
    applied to this problem space.
    3) A document defining a scheme for validating the phone numbers using
    publicly available open interfaces to the PSTN.
    4) A document defining client-server protocol between call agents and
    the entity within a domain that gathers and maintains information
    related to PSTN calls.
    5) A document describing a mechanism to mitigate SPAM issues.

    The working group will carefully coordinate with the security area, O&M
    area, as well as the appropriate RAI WGs such as sipcore and p2psip.

Goals and Milestones:
  Sep 2011 - Submit Requirements, Problem statement, and architecture overview for publication as Informational
  Dec 2011 - Submit Peer to peer base protocol specification for publication as Proposed Standard
  Dec 2011 - Submit PSTN based number validation techniques for publication as Proposed Standard
  Apr 2012 - Submit Specification of authorization tokens to mitigate SPAM for publication as Proposed Standard
  Apr 2012 - Submit Protocol for call agents to exchange call and routing information for publication as Proposed Standard

All charter page changes, including changes to draft-list, rfc-list and milestones:

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