How to detect phone ring?

[Chris Rende]

I'd like to write a daemon that simply logs when the telephone line rings.

I can handle the part that opens a file and writes out the date. :-)

But how do I detect or receive a signal that the phone line is ringing?

car.
-- 
Christopher A. Rende           Central Cartage (Nixdorf/Pyramid/SysVR2/BSD4.3)
uunet!edsews!rphroy!trux!car   Multics,DTSS,Unix,Shortwave,Scanners,UnixPC/3B1
car at trux.mi.org                Minix 1.2,PC/XT,Mac+,TRS-80 Model I,1802 ELF
trux!ramecs!car     "I don't ever remember forgetting anything." - Chris Rende