I'd don't have a solution for you, but I would be cautious about bluetooth.

http://eetimes.com/story/OEG20010330S0031 (hit refresh on this page)

>For the first item, he told me that this is not ready. This technology is mostly going to be out there first for cell phones. Then, when it'll be all tested and in full production, they'll be able to focus more on home phones.
>
>For the second item, he told me that some cell phones do support it. However, the one I have is not.
>
>Any comment?