There is an ITU standard called ENUM [1] that allows uri->phonenumber mapping to be represented in DNS, where a URI could be something like mailto:name@domain.c

There is an ITU standard called ENUM [1] that allows uri->phonenumber mapping to be represented in DNS, where a URI could be something like mailto:name@domain.com. I've never heard of it being used though. [1] http://en.wikipedia.org/wiki/Telephone_number_mapping http://en.wikipedia.org/wiki/Telephone_number_mapping