The UPT number uniquely identifies a UPT user and that is used to place a call to, or to forward a call to, that user.
A user may have multiple UPT numbers (such as a business UPT number for business calls and a private UPT number for private calls). In the case of multiple numbers, each UPT number is considered, from a network vantage point, to identify a distinct UPT user, even if all such numbers identify the same person or entity.
Read more about this topic: Universal Personal Telecommunications
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