Lurch is an AT&T 3b1 with 1.5 megs of ram and 30 megs of diskspace running Unix SVR2.0.. It used to be 0.5 megs of ram, but a friend took pity on us. Lurch's most entertaining piece of hardware is a Voice Power card, which is designed to do voice mail, etc. There are quite a few PBXs floating around the world that are driven by 3b1s with Voice Power cards.
To answer the phone, there is a bourne shell script which counts the rings, and on the third one hands control to the vda program. The vda program then runs a bunch of script files (in vda language) which do the actual "Press 1 to leave a message for..." part. When vda returns, another shell script makes a directory of all the message directorys, and uucp's (uucp is a unix file transfer program) it over to mcbsd (the WWW server).
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Here is the vda man page.
Here is a tutorial for vda.
Here is a copy of the software. This is a direct copy of the software running on lurch. files with the :e:v extension are sound files. They have been truncated to protect the innocent. (:-)).