Realistically, it will be a few years before VoIP is a widespread phenomenon in the home. VoIP products that use the Internet will, for the time being, be niche markets that can deal with the varying performance levels. In the next three to five years, however, VoIP on the Internet will make significant strides in the wake of two important developments:
Backbone bandwidth and access speeds will increase by several orders of magnitude, made possible by the deployment of IP/ATM/synchronous optical network (SONET), cable modems, and digital subscriber lines (DSL).
The Internet will become tiered, requiring users to pay for the particular services they need or want.
Fax over IP (FoIP) products and services over the public Internet ...