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Rate Center Pooling Status Designations is defined as follows:
 

  1. Mandatory (M)- This Rate Center is located in a top 100 MSA and service providers with numbering resources in this rate center that have not been granted a specific exemption must pool in this rate center.
     
  2. Mandatory State (MS)- Pooling was implemented in this rate center pursuant to a state commission order. This rate center is not in a top 100 MSA, but has one or more pooling-capable service providers, and is considered a mandatory pooling rate center.
     
  3. Mandatory Single Service Provider (M*)- This rate center is in the top 100 MSA, but has only one service provider that has numbering resources. This rate center will be considered optional under these conditions and designated as M*. When a second service provider receives numbering resources in this rate center, the designation will be changed to M for Mandatory.
     
  4. Mandatory State Single Service Provider (MS*)- Pooling has been implemented in this rate center pursuant to a state commission order. This rate center is not in a top 100 MSA and has only one service provider that has numbering resources. This rate center will be considered optional under these conditions and designated as MS*. When a second service provider receives numbering resources in this rate center, the designation will be changed to MS for Mandatory State.
     
  5. Optional (O)- This rate center is not in the top 100 MSA and any service providers with numbering resources in this rate center may elect to pool at its option. Service providers may voluntarily participate in thousands-block number pooling in an Optional rate center outside the top 100 MSAs.
     
  6. Excluded (X)- This rate center is not in a top 100 MSA and no service provider is currently participating in pooling. To begin pooling in an excluded rate center, you may submit the request directly in NAS which can be found under Thousands-Block/CO Code, Forecast, then Request Update to Excluded Rate Center or you may contact NANPA Customer Support at 866-623-2282 or support@nanpa.com for assistance.