[Asterisk-Users] Does it exist - DNS "TX" record?

[Chris Lee]

When handed a URL type address for telephony, is there a DNS "TX" record 
(like MX but for telephone/Video) that could be looked up for an address 
to use to connect the call?
I would like to have a "gateway server" (probably *) that anyone who 
knows the email address of a member of staff can use to connect to them 
with.
If the details of this server were in my DNS then anyone trying to call 
someone at cybericom.co.uk could find the server to make the connection 
with.

Regards
Chris.