Recently been receiving several calls from different phone numbers in the 315 area code.  Most left no voice message.  Twice the caller didn't realized my answer machine had picked up.  On both recordings there were many background voices / noise.  Sounded like a call center.

I believe these numbers are used by the same caller:
315-477-9766
315-329-2198
315-833-9279
and one where the caller was shown as "Private".