PPP-in-telnet allows Solaris users to establish a PPP tunnel through a firewall by means of a telnet proxy. It talks to the telnet proxy to connect to a pppd listening on a port on the Internet, and shuttles bytes between pppd and the telnet proxy.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.