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Besides landline phones, lots of systems currently rely on the PSTN, including:

Already, more than half of all U.S. homes have cut their connection to PSTN, and the pace is accelerating. 

By comparison, the operating expenses of native IP networks can be as much as 90 percent less than for PSTN.

In its visionary 2010 National Broadband Plan, the FCC acknowledged that “regulations require certain carriers to maintain” PSTN, a “requirement that is not sustainable” and which is forcing investments in network assets likely to be stranded in the transition. 

“Voice Link is a box put into the home with an antenna, but it can not do almost any data application that is part of the traditional, utility-based phone network, commonly called the “PSTN” or public switched telephone network,” Kushnick writes.