Jacki, check the links below.
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https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwib8OmE7PzKAhVmsYMKHbfJDpkQFggbMAA&url=https%3A%2F%2Fsupportforums.cisco.com%2Fdiscussion%2F11288626%2Fextension-not-valid-entry&usg=AFQjCNFAw1WgcAx3AxXWwewENUZSg-SNTQ&bvm=bv.114195076,d.amc
https://technet.microsoft.com/en-us/library/aa997885(v=exchg.150).aspx
https://technet.microsoft.com/en-us/library/bb124147(v=exchg.150).aspx
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