Get a VoIP account of your choosing and then set up an Asterisk box with some Polycom handsets. This will give you the ability to transfer calls around internally, provide you with voicemail.
Although it does sound like you're trying to get a proper business class (receptionist etc) service on the cheap, which is going to end in tears.
Although it does sound like you're trying to get a proper business class (receptionist etc) service on the cheap, which is going to end in tears.