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Anybody know if there are DID trunk standards?

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againwiththis

againwiththis

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By standards, I mean perameters such as voltage and impedence for DID trunks. Maybe PUC regulations..?

Any points in the right direction are appreciated.
 
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There are standards for all trunk types. Be mindful that with analog DID, the PBX provides the battery on the trunk. I know that Verizon's local tariff provides many of the technical details.
Mike
 
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