No, that is not a "dummy call", this number is legit from Dex's collection department. Unlike scammers, they'll leave their number and if you have a voicemail, etc, they'll leave contact info and what the call is about.
P WAYNE
2013-03-25 20:34:49
Debt Collector
re: 424-220-6077 --- so this really is a dummy call from Dex phone book ??
It does make you worried.....but I know I do not have any unpaid invoices from Dex 1