OC, not quite. There is no obligation to receive phone solicitations for tzedaka – in fact, millions of people managed to fulfill their obligation of tzedaka before the advent of the telephone. People these days have precious little time to spend with their family, and little patience to be interrupted at dinner time for a particular cause they will never want to donate to.
There ought to be a rule attached to the Do Not Call registry requiring opt-in for non-profit/political/survey calls.