X.25 is a circuit based packet switching protocol defined by the C.C.I.T.T. (a standards body recognized by Telecommunications companies in most parts of the world). An implementation of X.25 and LAPB are being worked on and recent 2.1.* kernels include the work in progress.
Jonathon Naylor firstname.lastname@example.org is leading the development and a mailing list has been established to discuss Linux X.25 related matters. To subscribe send a message to: email@example.com with the text "subscribe linux-x25" in the body of the message.
Early versions of the configuration tools may be obtained from Jonathon's ftp site at ftp.cs.nott.ac.uk.