Server command documentation?

[frank@gondor.nikoma.de]

Hi there!

	I'm planning to write a fax client which sends a postscript file to
	the fax server (like sendfax). The problem is that I couldn't
	find any documentation for the client-server protocol other than RFC
	959 (about FTP) and one-line descriptions of each command (in hfaxd(8)).

	Is there any documentation for the protocol available, especially for
	the J* commands, or would anybody explain how I can simply send
	a postscript file to the HylaFax server, specifying phone number, re-
	cipient names etc.?

Thanks in advance, Frank.