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Calling Party Number (CPN)
If you subscribe to the AT&T INFO2 ANI service or another PRI caller identification network service, an incoming call on an ISDN line includes accompanying information about the party placing the call. This can be either a station (extension) identification number that is defined by the internal dial plan of the system where the call originated (Extension Only), billing number information (Line Telephone Number), or both (Base Number with Ext.). With this information, a call recipient may identify the caller before answering.
