System information

There are many other numbering schemes that have been created as a result of an RFC.
Other IANA-managed numbers include MAC addresses—specifically, the Organiza-
tionally Unique Identifier (OUI) portion of the MAC addressing space.
Several years ago, a protocol named TRIP (Telephony Routing over IP) was created.
While this protocol never took off, and is unlikely to see any future growth, it did offer
us one incredibly useful thing: the ITAD. Since ITADs are part of an RFC, the IANA is
mandated to maintain a database of ITADs. This is what makes freenum.org possible.
IP Telephony Administrative Domains (ITADs)
Freenum.org takes advantage of IANA’s responsibility to maintain a database of ITAD
numbers and allows us to build simple, standards-based, globally relevant, and com-
munity-driven numbering plans for VoIP.
‡
You can find the list of currently assigned
ITAD numbers at http://www.iana.org/assignments/trip-parameters/trip-parameters
.xml#trip-parameters-5.
You will want to obtain your own ITAD number by submitting the form located at
http://www.iana.org/cgi-bin/assignments.pl.
This form should be filled out as shown in Figure 12-1.
Figure 12-1. Request for Assignments form
‡ Note that freenum.org has consulted with the folks at IANA in regard to the use of ITADs with protocols
other than TRIP.
252 | Chapter 12: Internet Call Routing