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Module 4: Deployment Requirements

7 Digit vs. 10 Digit LRNs

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Local Number Portability
          Changing from 7 to 10 Digit Dialing
So what does a CLEC do to change from 7 to 10 digit signaling?

When a CLEC requires signaling changes, the amount of time required to make changes will need to be considered. It is important to realize that changes intended for the network that are sent to the LERG, such as changes from a 7 to 10 TR EO (transmit to end office), have the potential to affect telephone customers' service, thus, the Maintenance Window Policy must be followed to make changes to the signaling network.

  • In the case of 7 to 10 digit changes, a service provider will need to plan for the change so that a decision can be made regarding what Effective Date (EFF DTE) to show in the LERG. The LERG also discusses minimum timing requirements for changes such as this, which require a long enough time period for all interfacing service providers to learn about the change, prepare their complex translations, and have resources available for a coordinated effort.

  • For a service provider, the interfacing company's sales executive must be notified to schedule and coordinate the changes with both companies' Routing Translations Groups. This will allow the involved service providers to make the necessary changes to their respective networks on the EFF DTE shown in the LERG, after planning for the minimum elapsed time as prescribed in the Industry Guideline above.

  • The "Central Office Code (NXX) Assignment Guidelines" discusses the timing considerations required to distribute the information to all LERG recipients. Information can be found at the following web site:

    ATIS Document Center

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