A new IETF working group has been set up to produce a DNS-based method of mapping telephone numbers to attributes such as URLs for devices such as pagers, faxes and modems. If implemented properly this could be very exciting. Imagine looking up my WAP phone in a directory to discover whether I can accept email or instant messaging or even whether I'm running a web server on it. This kind of information is already within the scope of DNS but most people (understandably) don't advertise what services are running on their servers. With devices it's a different story - I want you to know that my phone can handle faxes and voice mail.