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voip by ponorogo90


									                   VoIP Numbering Issues

Prepared by:

02/02/2011                                 1
                                                     VoIP Numbering Issues

1) Purpose and Format
     The purpose of this paper is to examine, from a numbering perspective only, the impact of Voice
     over Internet Protocol (VoIP). This paper will provide background information on VoIP service but
     the primary focus is intended to examine how the service uses telephone numbers from the PSTN
     and how this use potentially impacts the life and present assignment and administration of NANP

2) Description of Service
     i)    Many companies who provide VoIP service will and already are competing with service
           providers in the PSTN. In the October 2002 issue, of ISPWORLD the CEO of one VoIP
           provider, states that his company is not selling their specific brand of service to customers as
           VoIP phone service, but they “are selling it to them as a replacement to their existing phone
           service.” 1

     ii) VoIP service is described as a way for end users to get local, regional, and long distance
         nationwide calling. Many VoIP service providers offer features such as Call Waiting Caller ID,
         Personalized Voice Mail, Call Forwarding, Caller ID Block (*67), Repeat Dialing.

           The specific feature offerings that directly impact numbering are the ability of the customer to
               A telephone number in any area code of their choice;

                     The ability to take their telephone number with them when they move outside of their
                      current rate center.

     iii) Many VoIP providers’ services are based on Internet Session Initiation Protocol (SIP)2.

     iv) A high-speed Internet connection, such as a Cable Modem or DSL connection is required. In
         addition, a phone adaptor is required. One such VoIP service provider provides the customer
         with a Cisco ATA 186 Analog Telephone Adaptor, which converts the traditional analog phone
         into a SIP VoIP phone The adaptor converts analog voice into digitized voice signals and then
         into IP data packets. The adaptor is installed at the customer’s premise(s).3

3) Conceptual Diagram
     Figure 1 is a conceptual diagram of architecture used to support VoIP service. The diagram
     illustrates when a customer is assigned a TN from a non-home rate center. In this diagram, the
     customer who resides in the Atlanta rate center is assigned a number from a New York NPA/NXX.
     A call that originates from the PSTN to this Atlanta customer would be routed via the PSTN to New
     York. The call then is placed on the Internet via a Gateway server. The call is routed to the Atlanta

1 Erickson, Todd Judd, “VoIP Finally Flexes Some Market Muscle”, :ISPWORLD, October 2002
2 The Session Initiation Protocol (SIP) is based on the protocols used for emails and web pages, which follow a client-host model.
Users in a SIP network are identified by unique SIP addresses. A SIP address is similar to an e-mail address and is in the format of The user ID can be either a user name or an E.164 address.

3 The Cisco ATA 186 Analog Telephone Adaptor is a handset-to-Ethernet adaptor that interfaces regular analog phones with IP-based
telephony networks. The ATA 186 has two voice ports that can only support legacy analog touchtone telephones.

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       customer via the Internet. It should be noted that the customer can subscribe to this service without
       changing their existing NPA or rate center.

                                                     Figure 1.


                        Gateway                                                                              212-XXX-XXXX
 Class 5 End                                                                             Partner
 Office Or Tandem
                                                                              Gateway                   Adaptor

   New York                                                                                        Atlanta Customer with
                                                                                                   NY TN
   (212 NPA)

   4) Examples of Numbering Selection Currently Offered by Two VoIP Providers
       a) VoIP providers do not obtain numbers directly from NANPA. It appears they obtain numbers
          from LECs that have received numbers from NANPA. Today, the LEC service provider that
          provides the numbers to VoIP providers must report these numbers on NRUF as “Intermediate”
          numbers. The VoIP provider in turn re-assigns these numbers to their VoIP customers.

            In the previously cited example of service, the VoIP service provider allows customers to obtain
            and keep telephone numbers from any of the area codes where the VoIP service provider has
            received Intermediate numbers as long as they remain with that VoIP company. The following
            list includes some of the area codes served by one VoIP service provider:

                    California:      213 310 323 408 510 619 626 650 707 714 760 805 818 831 858 909
                                     925 949
                    Delaware:        302
                    Florida:         305 561 786 954
                    Georgia:         404 678 706
                    Illinois:        312 630 708 773 815 847
                    Indiana:         219
                    Massachusetts:   508 617 781 978
                    New Jersey:      201 609 732 856 908 973
                    New York:        212 347 516 631 646 718 845 914 917
                    Pennsylvania:    215 267 412 484 610
                    Texas:           409 832 936 979 214 254 469 817 903 940

            At least one VoIP provider advertises that by subscribing to their service the customer is no
            longer tied to their "local area code". The customer can select any area code they want from the
            list of available area codes where they operate. For example if a subscriber lives in New York,
            they can have a telephone number in a California Area Code. Their advertisement goes on to

   02/02/2011                                                                                            3
         state their service gives an appearance of a local presence without having to be physically
         located in that area.

         Two features that one VoIP provider presents as unique features of their service include
         allowing customers to keep their telephone number as long as they want and allowing customers
         to keep their numbers even if the customer changes location regardless of the their new location.
         Their website explains these features as follows:

             “Keep your ________telephone number for as long as you’d like. As long as you are a
             ________customer, you can keep your telephone number. Even if you move across the state,
             or across the country, you never have to change your telephone number again.”

             “Never before have you had the ability to take your home phone with you wherever you go.
             With _________, you can travel with your home phone or even move (emphasis added)
             without skipping a beat. Whether you’re traveling across the United States or anywhere else
             or you’re moving into a dorm, or another town; all you need is a high speed internet
             connection and the phone adapter (that we provide for free). It’s home phone service that
             goes with you.” This, in fact, is the same as maintaining a wireless telephone number and
             service when moving.

             It should be noted however that in this VoIP providers Terms and Conditions, they state that
             the “Customer has no proprietary or ownership rights to or interest in a specific phone
             number or phone numbers ("Number") assigned to you by _______, and the number is not
             portable to any other service provider.

    b) A second VoIP service provider allows a customer to get a personal number based on the area
       code of the customer’s choice. Also, each account includes voicemail that can be accessed from
       a telephone or from the web. This particular VoIP service provider advertises that customers
       can select any available area code from the list below, no matter where they live in the world.
       Their number is not constrained by the city that they live in.

         They currently offer numbers from the following area codes:

             Arizona:             480
             California:          213 415 510
             Colorado:            720
             Florida:             407
             New York:            347 646 718 917
             Pennsylvania:        610
             Texas:               214 281

         The company advertises that the customer should contact them if the above list does not contain
         the area code from which a customer wishes to request a telephone number.

5) Numbering Issues
    Shown below are excerpts from industry guidelines established by the Industry Numbering
    Committee, which is sponsored by ATIS. The FCC has plenary authority over the INC’s guidelines.
    This section contains identified numbering issues with VoIP type service and is divided into three
    sections: General Issues, Specific Numbering Guideline Issues and Technical Issues.

    a) General Issues
       i) Rate Center Assignment Principle

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                An assignment principle in the both the Industry Numbering Committee’s (INC) CO-NXX
                Assignment Guidelines and the Industry Numbering Committee’s Thousands-Block
                Number Pooling Assignment Guidelines is that service providers are assigned resources on
                a rate center basis4. This principle applies whether the service provider is applying for
                initial numbering resources in a rate center or additional numbering resources in a rate
                center. For initial resources in a rate center, a service provider must show proof of
                readiness and certification for providing service. For growth numbering resources, the
                service provider must show proof of need, and must show the months to exhaust and
                utilization requirement have been met.

                Issue Description:
                Entities that receive “intermediate” numbers do not have to meet utilization criteria today
                per the FCC. Many service providers, including VoIP service providers, can obtain any
                quantity of numbers from LECs anywhere in the country without meeting the requirements
                applicable to other certified service providers. This is in contrast to current requirements for
                the more conventional service providers who must track and report their quantities of
                intermediate numbers and use them in demonstrating their ability to meet the current
                Months-to-Exhaust requirements for growth numbering resources on a per rate center basis.

                Since VoIP service providers are interconnecting with the existing PSTN and using PSTN
                numbering resources, the primary question is: Should the number assignment rules that
                apply to conventional service providers apply to VoIP providers?

           ii) Impact on NPA Relief & NANP Exhaust
               VoIP provider’s current use of telephone numbers will expand the need for telephone
               numbers, which could advance the exhaust of the NPAs. Assigning telephone numbers
               from a particular NPA in one area of the country to customers that do not reside in that
               NPA (i.e. they may actually reside in another state) may accelerate the need for NPA relief.
               As VoIP service providers begin to obtain and assign numbers in this fashion, it creates
               additional demand. This issue also arose with the deployment of E-fax services and will
               continue to be an issue as new technologies are deployed offering alternatives to the
               traditional use of numbers.

                Issue Description:
                The impacts on NPA relief and NANP exhaust will no doubt cause concern with some state
                public utility commissions since NPA exhaust may be accelerated because telephone
                numbers are assigned to customers outside the NPA or even outside their respective state.
                For example, New York City residents can potentially be burdened with additional area
                code relief because subscribers not under New York regulatory jurisdiction could end up
                taking a large quantity of their numbers for use outside of the state. On the other hand,
                there is an impact on customers who keep their existing numbers when they move. In the
                past these numbers went back into a carriers inventory for reassignment to other customers.

                One other concern stems from the situation where a typical subscriber may already have a
                wireline phone, fax, cell phone etc., where they preside. VoIP service may encourage
                subscribers to add additional numbers from any number of cities. This scenario could lead
                to a single customer obtaining multiple sets of numbers from multiple cities. Should this
                concept become popular it could result in an acceleration of the demand for numbers.

4 The Industry Numbering Committee (INC) is an ATIS forum provides and provides a forum for customers and providers in the
telecommunications industry to identify, discuss and resolve national issues that affect numbering.

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         iii) Number Resource Utilization and Forecasting (NRUF) Reporting
              The definition of Intermediate numbers and how they are treated in utilization calculations
              and in NRUF reporting is currently under review by the NANC. Numbers obtained and
              used by VoIP service providers may impact NRUF reporting.

             Issue Description:
             Should VoIP service providers be accountable for how they use NANPA resources?

             The current arrangement requires VoIP providers to obtain individual telephone numbers
             from existing code holders.

             Also, should numbers given to VoIP service providers be reported and tracked using a new
             FCC numbering category?

    b) Specific Numbering Guidelines Issues
       i) Assumptions of the Industry Numbering Committee (INC) on Use of Numbers
          This section will review INC’s assumptions from the Central Office Code (NXX)
          Assignment Guidelines and the Thousands Block Number (NXX-X) Pooling Assignment
          Guidelines as adopted by the FCC. The issues address the use of NANPA resources and
          identify those assumptions, which appear to conflict with existing VoIP use of numbers.
          (1) Central Office Code Assignment Guidelines dated September 27, 2002
               (a) Assumptions 2.1:
                   The NANP resources are considered a public resource and are not owned by the
                   assignees. Consequently, the resources cannot be sold, brokered, bartered, or
                   leased by the assignee for a fee or other consideration. Transfer of code(s) due to
                   merger/acquisition is permitted.
                   If a resource is sold, brokered, bartered, or leased for a fee, the resource is subject
                   to reclamation.

                     Issue Description:
                     It should be clear to customers when purchasing service from any service provider
                     that the customer is not purchasing the number and does not own the number.

                 (b) Assumption 2.2
                     NANP numbering resources shall be assigned to permit the most effective and
                     efficient use of a finite numbering resource in order to prevent premature exhaust
                     of the NANP and delay the need to develop and implement costly new numbering

                     Issue Description:
                     The existing numbering resources have historically been allocated for specific
                     geographic areas. By assigning New York telephone numbers to Georgia residents
                     this geographic association is impacted.

                 (c) Assumption 2.10:
                     SPs and numbering resource administrators are responsible for managing
                     numbering resources in accordance with these guidelines and the orders of
                     applicable regulatory authorities.

                     Issue Description:

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                            INC numbering guidelines will have to be revised to incorporate VoIP applications
                            that use NANP numbers. Is it time for resellers and VoIP service providers to be
                            recognized as service providers subject to the accountability for their use of TNs?
                            Furthermore, the impacts of area code relief measures such as NPA splits must be
                            addressed as this may require changes to the numbers used by VoIP providers.

                      (d) Assumption 2.14:
                          It is assumed from a wireline perspective that CO codes/blocks allocated to a
                          wireline service provider are to be utilized to provide service to a customer’s
                          premise physically located in the same rate center that the CO codes/blocks are
                          assigned. Exceptions exist, for example tariffed services such as with the exception
                          of foreign exchange service.5

                            Issue Description:
                            Should all providers be afforded the opportunity to be excluded from this existing
                            assumption, permitting the use of numbers beyond rate centers? This is a large
                            issue since existing number assignment guidelines and regulations for the request,
                            use, and reporting of numbers are all rate center based.

     c) Technical Issues
        i) Number Portability
        According to the October 2002 issue of ISPWORLD, in September 2002, a VoIP provider
        planned to introduce number portability using partnerships with local exchange carriers (LECs).
        As VoIP service providers begin to offer local service, the impact of VoIP service on number
        portability requires examination.

           As background there are three types of portability. They are:

                (1) Service Provider Portability
                Service provider portability, as defined in the Telecommunications Act of 1996, is “the
                ability of end users to retain, at the same location, existing telephone numbers as they
                change from one service provider to another”.

                This is the type of portability that has been ordered by the FCC and implemented by LECs
                and will soon be implemented by wireless service providers.

                (2) Location Portability
                Location portability, as defined in the First Report & Order, Docket No. 95-116, is “the
                ability of users of telecommunications services to retain existing telephone numbers without
                impairment of quality, reliability, or convenience when moving from one physical location
                to another”.

                Location portability allows customers to take their telephone when they move to another
                geographic location outside of the original rate center.6

                (3) Service Portability

5 Foreign Exchange differs in that it uses a dedicated facility from the customer premise located in a foreign rate center to a switch of a code
holder in the serving rate center.
6 In the Second Memorandum Opinion and Order on Reconsideration in CC Docket 95-116, the FCC concluded that nothing in the Act
precludes them from mandating location portability; however, they had plans to address location portability.

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                 Service portability, as defined in the First Report & Order in Docket No. 95-116, is “the
                 ability of users of telecommunications services to retain existing telephone numbers
                 without impairment of quality, reliability, or convenience when switching from one service
                 to another service provided by the same telecommunications carrier7.

           Issue Description:
           The implementation of service provider portability was very complex and time consuming. The
           technical requirements and standards ordered by the FCC and adopted by the industry were
           developed by the industry after lengthy periods of analysis and discussion. The FCC adopted
           the industry recommendations and standards.

           From a service provider portability viewpoint, some questions that arise are:

                How will “porting” be done with a VoIP service provider? For example:

                  If VoIP service providers are going to complete calls to and from the PSTN, should
                   they also be required to have to implement LNP using LRN?

                  If VoIP service providers offer number portability will they need to interact with the

                Will a new subscriber that is assigned a PSTN telephone number from a VoIP provider be
                 able to port their number to a PSTN service provider if requested? If so, will that port be
                 limited to a specific geographic area? Should compatible system interfaces be developed to
                 port numbers between VoIP providers and PSTN providers?

                Does the definition or the role of N-1 carrier apply or change?

                Should the process of “snap back” be used when a number is ported from a PSTN service
                 provider to a VoIP service provider or is it correct to leave it with the VoIP provider who
                 has obtained the number form another type of carrier?

           These are just some of the portability issues that should be addressed when VoIP service
           providers begin to offer local service. In the end, the concept of location portability as it is
           known today may need to be revisited. For example, as other VoIP providers enter the market
           and offer limited location portability, an issue of standards may arise.8 Do standard bodies need
           to ensure that location portability is developed in a consistent manner and is compatible with the
           PSTN? Will location probability need to be offered by traditional LECs? Should there be a
           limitation to the geographic area for which location portability applies? These are just some of
           the issues that require examination.

     d) Other Issues
        i) Number Jurisdictional Issues
        With VoIP service providers offering local service with NANP resources, concerns regarding
        jurisdictional authority over numbering resources become a key issue. The FCC has plenary
        jurisdiction over the use of NANP resources. Specific aspects of that jurisdiction have been

7 The FCC is not addressing service portability at this time and requirements for service portability are still undefined
8 Limited location portability in IP telephony is implemented by the use of redirect servers and proxy servers. It is similar to call forwarding in
the PSTN

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         delegated to state regulatory bodies. As such, any concerns as to the ability of VoIP providers
         to use NANP numbers are to be guided by the intentions of the FCC. As technology continues
         to advance and the integration of IP telephony and the existing PSTN develops, it becomes
         necessary for the industry as a whole, (wireline, wireless, VoIP, CLEC, DLEC, etc.) to provide
         the FCC with solid data and facts to permit the FCC to make its decision on the appropriate use
         and applications for NANP numbering resources.

         Embedded within the jurisdictional issue is the matter of how the cost of NANP number
         administration is paid and prorated. With VoIP service offerings, VoIP is obtaining numbers
         that were originally allocated to LECs. Therefore the LEC pays for the administration of that
         number. In the future, the question will become should the VoIP providers also pay for the
         numbering resources administration under the required guidelines. These administrative issues
         should be dealt with, once the jurisdiction issues are addressed.

         Finally, 911 and other N11 dialing capabilities and requirements may vary from State to State.
         These must be clearly evaluated as a to if and how VoIP will support these dialing capabilities
         and requirements.

6) Summary
    One of the major challenges resulting from the integration of the PSTN and Internet is the status of
    calls that pass from one network service provider to another service provider between the PSTN and
    the Internet. Due to multiple architectural configurations for VoIP, a lack of existing all-
    encompassing industry standards, and an indeterminate regulatory landscape, the current numbering
    paradigm as applied to numbering responsibilities and obligations needs to change in this
    developing environment. The change is a complex problem to solve. Today’s rules and regulations
    address number assignment, number use and the responsibilities of both regulators and Industry
    only in a PSTN environment. These rules and regulations have been formulated to maximize the use
    and life of the existing NANP numbering resources. VoIP service represents a new element and
    application that will have an impact on the life of the NANP. In the past the introduction of cell
    phones, CLEC entry, pagers and other services have impacted NANP numbering resources and
    consequently changes were adopted.

    It will be necessary to address the constraints that PSTN service providers must operate under in
    order to obtain and use NANP resources when incorporating the VoIP service providers use of
    numbers into the rules and regulations.

    In order to support PSTN and Internet integration it is necessary that all numbering issues be
    thoroughly examined. Thus, as new implementations of VoIP are introduced (e.g. ENUM), or for
    that matter any future use of the numbering resources, issues involving numbering in VoIP
    environments need to be identified and examined to determine their impact on the North American
    Numbering Plan (NANP).

    It’s recommended that the NANC assist the FCC in addressing these numbering issues to prevent
    any disparities that are arising based on existing regulations to achieve true NANP resource

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