I have a customer who has an AXXENT the Cpu based system.

Yesterday they called and said that there original vendor came out and replaced some boards on the main system (witch boards they did not know) after changing the boards customer still could not break dial tone and there vendor said the unit would need to be replaced.

They are able to receive calls and access lines but when you try to dial dialtone is still there. Has anyone came accross this before? and is so what is the fix?

Thanks in Advance