[sdiy] [Way OT] Distinctive ring

[mrmike]

Sorry for the vary off-topic post, but is anyone here familiar with 
distinctive ring for telephones? This feature allows a single incoming 
phone line to be addressed by multiple phone numbers, each with its own 
ringtone.  I'm trying to figure out how to DIY a device that will 
recognize and filter the rings.

Well, it's analog, and DIY anyway...

Thanks,
clickmrmike