Ask HN: handling customer support calls as a small business?

Are there any cheap phone systems that a small business can use for customer support phone calls? Our support staff is really just one guy but we would like some order and efficiency.

We need basic functionality like:

* allow callers to select a menu option and placing them in different queues depending on the option they've selected.

* set up opening hours so that callers are greeted with a message after a certain time of day.

* allow callers to enter their member id and password so that it might be retrieved by support staff.