I am a realtor with a RC phone # for leads that needs to go round robin to my agents but I can't seem to get it to work...

I have the two agents saved as extensions 800 and 801. When someone calls the sign phone number the auto receptionist says "Press 1 if you are an unrepresented buyer, 2 if you are a represented buy" and it is supposed to alternate between extension 800 and 801.... That's not happening and I can't figure it out. Tech support can never seem to get it right.....