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Hello friends, tell me what is Number exchange?
Colton 03-October-2007 06:33:21 PM
Comments


Usually referred to as Pots-PSTN number exchange system.
Posted by sagitraz


The PSTN number exchange system
Posted by waqasahmad


it is basically the Pots-PSTN number exchange system
Posted by HamidAliKhan


NXX. Usually corresponds to the prefix in the additional POTS-PSTN telephone numbering system.
Posted by elie
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