Telcordia
`Notes on the Networks
`
`
`
`Telcordia Technologies Special Report
`SR-2275
`Issue 4
`October 2000
`
`An SAIC Company
`
`AT&T Exhibit 1015
`AT&T v. VoIP, IPR 2017-01384, Page 1
`
`

`

`Telcordia Notes on the Networks
`Copyright Page
`
`SR-2275
`Issue 4
`October 2000
`
`Telcordia Notes on the Networks
`
`SR-2275 replaces SR-2275, Bellcore Notes on the Networks, Issue 3, December 1997.
`
`Related documents:
`
`SR-NOTES-SERIES-01, Telcordia Notes on the Synchronous Optical Network
`(SONET)
`SR-NOTES-SERIES-02, Telcordia Notes on Dense Wavelength-Division
`Multiplexing (DWDM) and Optical Networking
`SR-NOTES-SERIES-03, Telcordia Notes on Number Portability and
`Number Pooling
`SR-NOTES-SERIES-04, Telcordia Notes on the Evolution of Enhanced
`Emergency Services.
`
`To obtain copies of this document, contact your company’s document coordinator
`or your Telcordia account manager, or call +1 800.521.2673 (from the USA and
`Canada) or +1 732.699.5800 (all others), or visit our Web site at www.telcordia.com.
`Telcordia employees should call +1 732.699.5802.
`
`Copyright © 2000 Telcordia Technologies, Inc. All rights reserved. This document
`may not be reproduced without the express written permission of Telcordia
`Technologies, and any reproduction without written authorization is an
`infringement of copyright.
`
`Trademark Acknowledgments
`Telcordia is a trademark of Telcordia Technologies, Inc.
`CLCI, CLEI, CLFI, CLLI, ISCP, NMA, and SEAS are trademarks of Telcordia Technologies, Inc.
`COMMON LANGUAGE, SPACE, TELEGATE, AIRBOSS, and TIRKS are registered trademarks of
`Telcordia Technologies, Inc.
`CLASS is a service mark of Telcordia Technologies, Inc.
`Appletalk is a registered trademark of Apple Computer, Inc.
`DECNet is a trademark of Digital Equipment Corporation.
`1/1AESS, 4ESS, 5ESS, Dataphone, and SLC are registered trademarks of Lucent Technologies, Inc.
`DMS-10, DMS-100F, DATAPATH, and TOPS are trademarks of Nortel.
`DMS-100 is a registered trademark of Nortel.
`NEAX-61E is a trademark of NEC America, Inc.
`EWSD is a registered trademark of Siemens AG.
`
`Any other companies and products not specifically mentioned herein are trademarks or service marks
`of their respective trademark and service mark owners.
`
`ii
`
`AT&T Exhibit 1015
`AT&T v. VoIP, IPR 2017-01384, Page 2
`
`

`

`Telcordia Notes on the Networks
`Numbering Plan and Dialing Procedures
`
`3.6.3
`
`Coin Station Numbering
`
`SR-2275
`Issue 4
`October 2000
`
`It has been recommended that public and semipublic stations be assigned line
`numbers in the 9000 series (for example, NXX-9XXX). Generally, current operating
`practices include a check for public/semipublic telephones on collect or third-
`number calls to 9000 series numbers only.
`
`Many public/semipublic telephones meet the requirements for an automated check.
`In those cases where the automated public/semipublic station check can be applied,
`there is no need to have the called public station numbered in the 9XXX series.
`
`However, there are still many situations in which the 9XXX line number is the only
`indication of a public/semipublic station. Therefore, it is still suggested that
`companies assign public/semipublic stations in this 9XXX line number series when
`possible.
`
`3.7
`
`Dialing Procedures
`
`Dialing refers to the use of certain digits or special characters as prefixes or
`appendixes to the number address as defined by the NANP. In the U.S., dialing is
`regulated by local public utility commissions, and as a result, dialing patterns vary
`from one jurisdiction to another. For example, the digit “1” is used in the NANP to
`indicate that the full 10-digit NANP number will follow. The prefix “1” is also used
`in many areas of the NANP to indicate that a call within the “home” NPA will incur
`a toll charge. In such a use, the “1” is part of the dialing plan. Table 3-3 illustrates the
`major dialing options in use.
`
`Table 3-3. Major Dialing Options
`
`Option I
`
`Option II
`
`Option III
`
`Local call within home NPA
`Toll call within home NPA
`Local call across NPA boundary
`Toll call across NPA boundary
`
`7 digits
`7 digits
`1 + 10 digits
`1 + 10 digits
`
`7 digits
`1 + 10 digits
`10 digits
`1 + 10 digits
`
`7 digits
`1 + 10 digits
`1 + 10 digits
`1 + 10 digits
`
`In all options, 7-digit local calling is permitted for calls within the home NPA, except
`in areas where NPA overlays have been implemented. In these areas, all calls must
`be dialed on a 10-digit basis as directed by the FCC in its Second Report and Order
`in CC Docket 96-98.
`
`Several different dialing arrangements are in use for local calls that cross NPA
`boundaries. In some locations these calls may be dialed on a 10-digit basis, without
`the prefix “1.” In other locations, 7-digit dialing to foreign NPAs is retained through
`the use of “protected” NXX codes. The use of protected codes is discouraged
`because it uses central office codes inefficiently and may contribute to the
`premature exhaust of an NPA.
`
`3–8
`
`AT&T Exhibit 1015
`AT&T v. VoIP, IPR 2017-01384, Page 3
`
`

`

`SR-2275
`Issue 4
`October 2000
`
`Telcordia Notes on the Networks
`Numbering Plan and Dialing Procedures
`
`Because dialing patterns vary in the NANP, the industry felt it was important to
`develop and recommend a uniform dialing plan. The resulting document, INC 97-
`0131-017, Industry Numbering Committee Uniform Dialing Plan, recommends
`that all calls be dialed on a uniform 10-digit basis, eliminating the use of the prefix
`“1” as a toll indicator. If required, however, toll indication could be provided in
`another manner such as a tone indicating that the caller will incur additional
`charges. Although the industry has made its recommendation, no decisions have
`been made on implementation.
`
`Tables 3-4 through 3-6 show additional details of dialing procedures available for
`use with FGD.
`
`3–9
`
`AT&T Exhibit 1015
`AT&T v. VoIP, IPR 2017-01384, Page 4
`
`

`

`Telcordia Notes on the Networks
`Numbering Plan and Dialing Procedures
`
`SR-2275
`Issue 4
`October 2000
`
`Table 3-4. Recommended Dialing Procedure for Directory Assistance Under
`Feature Group D
`
`Type of
`Call
`IntraLATA
`HNPA*
`FNPA
`HNPA**
`FNPA**
`InterLATA
`HNPA*
`FNPA
`HNPA
`FNPA
`
`Dialing
`Procedure
`
`Operator
`Reached
`
`411 or 555-1212
`1+ NPA-555-1212
`101XXXX-555-1212
`101XXXX-1+NPA-555-1212
`
`LEC
`LEC
`IntraLATA Carrier
`IntraLATA Carrier
`
`555-1212
`1 + NPA-555-1212
`101XXXX-555-1212
`101XXXX-1+NPA-555-1212
`
`LEC
`IC†
`IC†
`IC†
`
`Legend:
`FNPA
`HNPA
`IC
`LATA
`LEC
`NPA
`
`Foreign Numbering Plan Area
`Home Numbering Plan Area
`Interexchange Carrier
`Local Access and Transport Area
`Local Exchange Carrier
`Numbering Plan Area
`Use of the prefix 1 is acceptable in areas where Centralized Automatic
`Message Accounting (CAMA) access is required.
`
`======
`
`Only applies in those areas where intraLATA competition is allowed.
`
`Presubscription applies to interLATA directory assistance calls. The call
`will be handed off to the IC, but the IC business arrangement with a LEC to
`provide directory assistance may result in reaching a LEC operator.
`
`* *
`
`*
`
`†
`
`3–10
`
`AT&T Exhibit 1015
`AT&T v. VoIP, IPR 2017-01384, Page 5
`
`

`

`SR-2275
`Issue 4
`October 2000
`
`Telcordia Notes on the Networks
`Numbering Plan and Dialing Procedures
`
`Table 3-5. Treatment of 0 and 00 Dialed Calls from Equal-Access End Offices
`
`Dialing Format
`
`Suggested Disposition Equal-
`Access End Office
`
`LEC
`
`IC*
`
`IC
`
`IC**
`
`0
`
`0 0
`
`101XXXX + 0
`
`101XXXX + 00
`
`101XXXX + 0+7/10D
`
`IntraLATA - IC, if permitted†
`
`00 + 7/10D
`
`IntraLATA - LEC‡
`IntraLATA - IC‡
`
`Interexchange Carrier
`Local Access and Transport Area
`Local Exchange Carrier
`Any digit 0 through 9
`Digits
`Assumes subscriber is presubscribed.
`
`=====
`
`While this is not a NANP dialing standard, to avoid customer
`confusion 101XXXX + 00 dialed calls should be processed and
`routed to the IC operator facility.
`
`Because regulatory treatment of IntraLATA competition varies
`widely, this section does not specifically address dialed 0+ 7/10D
`where such competition is allowed.
`
`00 + 7/10D and 101XXXX + 00 + 7/10D dialed calls are not defined
`in the NANP. Upon completion of dialing 00, the call would
`generally be routed to the IC operator facility, and subsequent
`digits would be acknowledged. This may only apply to
`subscribers with DTMF telephones; calls of this type generated
`by rotary dial customers may not be processed.
`
`Legend:
`IC
`LATA
`LEC
`
`XD
`
`* *
`
`*
`
`†
`
`‡
`
`3–11
`
`AT&T Exhibit 1015
`AT&T v. VoIP, IPR 2017-01384, Page 6
`
`

`

`Telcordia Notes on the Networks
`Numbering Plan and Dialing Procedures
`
`SR-2275
`Issue 4
`October 2000
`
`Table 3-6. Dialing Procedures Available with Feature Group D
`
`Dialing Format
`101XXXX + (1) + (NPA) + NXX + XXXX
`101XXXX + 011 + CC + NN + (#)**
`
`Destination
`Carrier specified by 101XXXX.
`
`
`Presubscribed carrier.
`Presubscribed carrier operator
`function.
`
`Presubscribed carrier
`LEC
`Presubscribed carrier operator
`function.
`LEC operator function.
`
`
`
`Operator function of carrier specified
`by
`101XXX.
`
`LEC operator.
`
`Presubscribed carrier operator
`function.
`
`
`
`011 + CC + NN + (#)**
`01 + CC + NN + (#)**
`
`(1) + (NPA) + NXX + XXXX (InterLATA)
`(1) + (NPA) + NXX + XXXX (IntraLATA)
`(0) + (NPA) + NXX + XXXX (InterLATA)
`(0) + (NPA) + NXX + XXXX (IntraLATA)
`
`101XXXX + 0+ (NPA) + NXX + XXXX
`101XXXX + 01 + CC + NN + (#)†
`
`0
`
`0 0
`
`101XXXX + 0
`
`1 + ERC+ NXX + XXXX
`
`101XXXX + (0/1) + SAC + NXX + XXXX
`
`Operator of carrier specified by 101XXX.
`
`101XXXX + #‡
`
`Carrier determined by 6-digit or 10-
`digit
`translation of ERC+ NXX.
`
`Carrier specified by 101XXXX.
`
`Carrier specified by 101XXXX.
`
`Legend:
`CC
`ERC
`
`PA
`
`NN
`
`X
`**
`
`†
`
`‡
`
`3–12
`
`Country Code
`Easily recognized code
`Any digit 2 through 9
`Numbering Plan Area code
`Any digit 0 through 9
`( ) indicates optional dialing digits.
`
`=====
`
`(#) indicates that dialing the character # (on DTMF touch-tone telephones)
`at the end of an international address is desirable but not required. If used,
`it eliminates the need for timing in some cases.
`
`# indicates that the character # at the end of a dialed Carrier Access Code
`(CAC) is required.
`
`AT&T Exhibit 1015
`AT&T v. VoIP, IPR 2017-01384, Page 7
`
`

`

`SR-2275
`Issue 4
`October 2000
`
`Telcordia Notes on the Networks
`Numbering Plan and Dialing Procedures
`
`3.8
`
`Dialing Prefixes for Carrier Selection
`
`As a result of the Modification of Final Judgment (MFJ), the GTE consent decree,
`and the implementation of access change plans in state as well as federal
`jurisdictions, many callers are required to select an IC for calls that cross LATA
`boundaries. ICs connect their facilities to many LEC networks using several
`different access arrangements. The most common access arrangements are Feature
`Group B (FGB) and Feature Group D (FGD).
`
`FGB callers reach an IC’s facility by dialing 950-XXXX. The XXXX digits in the 950
`number identify the IC and are called the Carrier Identification Code (CIC). CICs are
`assigned in accordance with industry-approved guidelines documented in INC 95-
`0127-006, CIC Administrative Guidelines.
` When the call is “cut through,” the IC
`switching equipment provides a second dial tone indicating that the caller must dial
`a Personal Identification Number (PIN) plus the number to be called.
`
`FGD permits callers to presubscribe to or select a specific IC on a per-call basis. If
`the caller wants to use the presubscribed carrier, only the called number need be
`dialed. FGD also allows the caller to override presubscription on a per-call basis and
`choose an alternate IC by dialing 101XXXX + 0/1 + 10 digits. The 101XXXX dialing
`prefix is called the Carrier Access Code (CAC). The last four digits of the 101XXXX
`CAC are the CIC.
`
`Note that CICs for FGB and FGD access are assigned from separate pools.
`
`3.9
`
`Operator Assistance
`
`Callers reach the LEC operator by dialing 0 (zero). To reach the presubscribed IC
`operator, 00 (zero zero) is dialed, where available. A presubscribed customer
`should also be able to dial 101XXXX + 0 to reach an alternate IC operator facility.
`In non-equal access end offices, 00 can be routed either to the LEC operator facility,
`to a single IC’s operator facility, or it can be blocked.
`
`3.10 International Direct Distance Dialing
`
`There are three major types of carriers involved in international calling.
`(cid:127) International Carriers (INCs) provide call transport between a United States
`gateway and a foreign country’s gateway where the international carrier
`connects to the foreign terminating network.
`(cid:127) Interexchange Carriers (ICs) provide call transport between the originating
`LATA and the IC’s gateway office.
`(cid:127) Interexchange/International Carriers (IC/INCs) provide transport between
`the originating LATA and a foreign country’s gateway.
`
`3–13
`
`AT&T Exhibit 1015
`AT&T v. VoIP, IPR 2017-01384, Page 8
`
`

`

`Telcordia Notes on the Networks
`Numbering Plan and Dialing Procedures
`
`SR-2275
`Issue 4
`October 2000
`
`Most international calls are handled by INCs. On some international calls, however,
`both ICs and INCs are involved, which implies that two carriers are selected by a
`single CAC - the INC indirectly.
`(cid:127) A single carrier (IC/INC) provides both interLATA and international transport,
`and uses a single CAC that includes both.
`(cid:127) An IC and an INC, having separate CACs, can agree to handle each other’s
`traffic. A customer placing an International Direct Distance Dialing (IDDD) call
`could use either carrier’s CAC. The interLATA portion would be handled by the
`IC and the international portion would be handled by the INC. An IDDD caller
`is not able to independently specify both an IC and an INC for an international
`call. Except in the case of a carrier that provides both functions, the caller will
`specify either the IC or INC of choice. The other carrier (INC or IC, respectively)
`involved will be the result of a prearranged business agreement.
`
`When an international call is dialed by a customer in a national network, the local
`switching system must be able to recognize that it is receiving an international
`address. In the NANP, a local switching system with IDDD capability is alerted to
`the fact that an international number is being dialed by use of a special prefix code.
`The following dialing patterns are used for IDDD in the NANP.
`
`For station-paid direct-dialed
`calls:
`
`011 + country code + national
`number
`
`For operator-assisted calls:
`
`01 + country code + national number
`
`The list of current country code assignments can be found in Section 1.10 of the
`LERG.
`
`
`3.11 0XX and 1XX Codes
`
`Within the NANP there are two series of 3-digit codes — 0XX and 1XX — that are
`not used as NPA or central office codes but are used for various specialized
`interoffice purposes. End offices or their associated Centralized Automatic
`Message Accounting (CAMA) offices will not accept a 7-digit or 10-digit address
`having a 0XX or 1XX code in the NPA or central office code field. Although not
`subscriber-dialable, such codes are accepted and routed by switching systems
`when received via an intermachine trunk or a source authorized to generate them
`(for example, a testboard). In the past, 0XX codes were typically used as a pseudo-
`central office code to route special calls to a switching office that did not have a
`normal central office code assigned (for example, a toll office). These codes were
`also used to route special calls to a switching office termination that a LEC did not
`want dialed using a normal address. When 0XX codes serve a pseudo-central office
`code function, they are used in conjunction with an NPA code so most of the codes
`can be reused in each NPA.
`
`3–14
`
`AT&T Exhibit 1015
`AT&T v. VoIP, IPR 2017-01384, Page 9
`
`