mm wrote:

snip

I can't figure out what CPC Disconnect is. Especially as it pertains
to a simple residential line.


From the online glossary at: http://www.vikingelectronics.com/glo...lecom-term.php

CPC - Calling Party Control (Disconnect Supervision) A short break
in the line current in the called party’s phone line when the calling
party hangs up. Not available on PABX’s.

The answering machine can detect calling party hangups and react accordingly.

Regards,

Michael