1. A system for customizing a communications network, the system comprising: a first communications device of or associated with a called party; a second communications device associated with a network address for initiating a call to said first communications device, wherein said network address is of or associated with a calling party; a network storage device containing a plurality of ringback tones and a plurality of network addresses; a local storage device containing at least one prerecorded announcement and at least a ringback tone; wherein said first communications device accesses said system for the purpose of transmitting a code regarding creating an association between said network address of said plurality of network addresses and one of said at least one prerecorded announcement and said at least one ringback tone of said plurality of ringback tones, wherein said code being transmitted from said first communications device, wherein said code identifies said at least one ringback tone on or said prerecorded announcement, and further wherein said system replaces at least a portion of an audible call progress signal intended for said second communications device with said prerecorded announcement or with said at least one ringback tone, wherein one of said prerecorded announcement or said at least one ringback tone being delivered from said network storage device or said local storage device, wherein a portion of said call progress signal is replaced after initiation of said call but prior to active communication with said first communications device.