i missed a call from this number, i returned the call an it said it was a fundraising center, but did not specify what the funds were for on a message
i listened to the voice mail and had the option of pressing 1 to indicate i was not interested in donating to the fundraiser. it said please note it will take thier system 24 hours to update.
i hope interacting was the right thing, if i get spammed by a million other calls for it i will likely come back here and update in order to warn others and to hamper the whoever-it-was. if truly it's a legit opt out, very considerate for an unsolicited call, still no idea who this is.