In the Rate Center Reports, the Pooling Status designation 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 (M) - 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 located in a 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 (M*) - 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 M*. When a second service provider receives numbering resources in this rate center, the designation will be changed to M for Mandatory State.

5. Optional (O) - This rate center is not in a top 100 MSA and any service provider 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. This rate center is not included in the Pooling Administrator System.

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