I checked with both of them. Packet8 does indeed offer service in Sylva, which is local to Cullowhee. Broadvoice kept me on hold for ages, but (when they finally picked me up) they denied that they offered service anywhere in NC.
While listening to Broadvoice's pretty music, I got on the BBB site and checked both of them out. Neither one has a very good reputation with the BBB. I thought I'd compare Vonage and found that while Vonage has had complaints, they've worked to resolve those complaints.
Unless someone knows a better company that offers service in that area, I guess I am going to try Packet8 as there doesn't appear to be an alternative.
Verizon is the local company. I called them to arrange to get a phone book for that area. At first, they told me that because I didn't have a Verizon account, I couldn't get one. But when I mentioned $$$$, they agreed to ship me one for thirty dollars. I thought that was high, but it's better than not getting one.
Regards,
Fred