I run an online retail web store where I frequently customize items for customers, hence they will call me, plus I run a design and concierge business that involves clients of all levels calling me, both regular small business owners and some uppercrust executive types.
I have a regular business phone and fax, considered an 800 number but said, "Nah" because people need to accept my life and myself as I am ~ complete with my 5 birds talking and singing in the background and my iguana occasionally leaping from one side of her habitat to the other. They are my "kids".
If a client considers me unprofessional because I live in the real world and work from home, oh well.
It's my manner that lends the professionalism, not my surroundings. You do what you are comfortable with and what fits into the budget. I never personally feel comfortable with a mechanized phone system, but that's just me.
You go with your instinct and what feels right.