I have a strange problem on a new IP Office install. I have two numbers here that work to the end of the patch cords on my **** set, but when I plug them in to the IP office(any CO Port), I get voltage, but no dialtone. I have two other numbers that work no matter what CO port I plug them into. I have tried different cords. I can dial numbers out on the two that are not working, but they do not process properly(I get a bell intercept message).