Tony, If you hang up for more than 12 seconds, it should release the line, regardless of whether the caller has hung up.
David W. In a message dated 12/31/2005 6:24:10 PM Eastern Standard Time,:
He called again at 5:29 AM ... same number so I picked the phone up
> and pushed a button for about 30 seconds ... then released and
> listened ... he already hung up