The documents say for a selector code, choose an Extension or Hunt Group. How do you enter a Hunt Group? Or can you? I have HG 3 and 4 with my extensions but it will not accept 3 or 4 or 03 or 04 for the entry in a selector code. Should I use a Calling Group instead cuz of the VS limitations? Finally what the heck is meant by a "direct extension transfer" and how is that used?