Caller ID said "unavailable." When I answered and asked about the nature of the call, the caller said, "This is Mark Gamble and the purpose of this recorded call is ......" I told him the call was NOT to be recorded and he hung up.
Caller claims to be from the "Veterans Homeless Shelter", but with so many scams and spams that pretend to be affiliated with known (and worthy causes) non-profits (as demonstrated by a 60 Minutes episode on the subject). As a result I only deal with the organization directly and never through an unsolicited phone call.