Setup instructions for Asterix and Exchange 2007 UM

I still haven’t had time to play with configuring Asterisk to work with Exchange UM, but luckily other folks have. Alan Dutton has just posted instructions on how to connect Asterisk to Exchange UM. The configuration looks fairly straightforward, by Asterisk standards anyway. I look forward to testing it; eventually I’ll have to go back and update my old post on the topic. Well done, Alan.