CO Code Guidelines

|  Assignment Guidelines  |  Assignment Request & Confirmation Forms  |

Click here to access the CO Code status information by Area Code.

CO Code Assignment Guidelines

The current CRTC-approved Canadian Central Office Code (NXX) Assignment Guidelines are available below.  They are available as MS Word documents:

• Central office code assignment practices (CRTC staff letter dated June 01, 2010)
• Canadian Central Office Code (NXX) Assignment Guidelines
• Appendix A - Audits
• Appendix B - Months-to-Exhaust Certification Worksheet
• Appendix C - Time Lines
• Appendix D - Plant Test Code Application and CNA Response/Confirmation Form
• Appendix E - Location Routing Number (LRN) Assignment Criteria
• Appendix F - Aging and Administration of Disconnected Telephone Numbers
• Appendix G - Reserved and Held Telephone Numbers
• Appendix H - Special Administrative Measures with respect to Code Holders that cease Business Operations

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Central Office Code (NXX) Assignment
Request and Confirmation Forms

|  Part 1  |  Part 2  |  Part 3  |  Part 4  |

Part 1

• Part 1 - CO Code Assignment, Reservation, Information Change, or Return

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Part 2

During CSCN 60, agreement was reached that Telcordia™ Routing Administration (TRA) Part 2 Forms, as developed and amended from time to time by TRA, can be used by Canadian CO Code Holders to facilitate data entry into the TRA database.  The CNA is not required to provide Part 2 Forms of any vintage to any party.

A Job Aid to assist Code Applicants in completing the Part 2 Form may be obtained from Telcordia TRA by calling 732-699-6700, by facsimile at 732-336-6999, or by internet website at www.trainfo.com.

• Part 2 - Routing and Rating Information Forms 1-8

• INC Part 2 - Data Provider Information Form
• INC Part 2 - Routing and Rating Information Form 1
• INC Part 2 - Routing and Rating Information Form 2
• Note: Form 3 is no longer required.
• Note: Form 4 is no longer required.
• Note: Form 5 is no longer required.
• INC Part 2 - Routing and Rating Information Form 6
• INC Part 2 - Routing and Rating Information Form 7
• INC Part 2 - Routing and Rating Information Form 8

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Part 3

• Part 3 - CNA's Response/Confirmation

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Part 4

• Part 4 - Code Holder's Confirmation of Code In-Service Date

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