TPC allows free faxing online, with small adverts appended to the bottom of each fax to pay for the service. is no longer around, however, has taken it place to try and continue the service as well as keep the memory of it alive. This service was first created in 1993, not more than a few years after the internet itself.

The primary purpose of the subdomain is to provide transparent mappings between users of general-purpose computers on the Internet and special-purpose devices directly connected to the telephone network.tpcint document rfc1530