DID Number

A phone number routed from the network to a specific phone in a PBX requires unique DID trunks or ISDN PRI “two-way DID” trunks. Blocks of DID numbers (typically 10 or 20) are purchased from the LEC or CLEC for use on the PBX. The number of DID numbers usually substantially exceeds the number of trunks in the system.

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DID Number

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