Not sure what it means to have your number published in the Chamber of Commerce Directory so I don't know why that would matter or be any different than just pulling it from a telephone book. Also I can't comment on your state law since I do not know it. I mainly wanted to point out things to be aware of before starting.
Like rlcarey said before, the Do Not Call List under federal law applies residential telephone numbers, including wireless numbers.
But the "TELEMARKETING SALES RULE" defines a person as "any individual, group, unincorporated association, limited or general partnership, corporation, or other business entity." So you may wish to read up on it before starting any telemarketing campaigns.
I am not up on this Rule because fortunately for me, my Bank does not place solicitation calls to consumers who do not meet the EBR or express permission exemptions. I think that the Telemarketing Rule is mainly for interstate calls, but you should read up on it. Also it is an FTC rule, which banks are not normally required to follow, but if the FCC has its own version of it or if the Rule specifically mentions banks as having to comply, then it will apply.
Hope this helps and happy reading