ENUM

The ENUM^7.12 service allows the mapping of telephone numbers (Rule E.164) in names associated to IP addresses, using an architecture based on the DNS service. Those names may be from the protocol SIP, H.323, Email etc. In order to consult the DNS, ENUM inverts the telephone numbers, giving them the prefix e164.arpa. which is the root of the tree. This tree is delegated to all countries of the world taking into account their codes E.164. this way, the Portuguese delegation shall be the inverted 351 - 1.5.3.e164.arpa.

In IPBrick, you can define the ENUM zones where a number search can be made. For that you'll have to click on the connection Insert and input the ENUM zone domain. In Order it's possible to define which are the priority zones where the number search shall be made. In Figure 7.40 a list of the ENUM zones may be visualized.

Once the list of the ENUM zones is defined, where to search numbers, the ENUM may be used in VoIP routes. Next, an example is given:

1. In IPBrick.C - VoIP - Routes Management, there is a Output Route for Sip Servers - VoIPBuster.
   There it is necessary to activate the option Activate ENUM Search in the Route Definitions;
2. A certain user of the network calls through the SIP/PBX to number +351 253 59 31 12;
3. Automatically, a research is made in the ENUM zones specified in the present menu for 2.1.1.3.9.5.3.5.2.1.5.3.e164.arpa, in order to obtain the correspondence of that number in a certain IP address/name;
4. Supposing that the research results in the SIP address joaod@domainx.com, a SIP call is made to the address joaod@domainx.com;

Figure 7.40: Support Services - ENUM

Footnotes

... ENUM^7.12

Telephone Number Mapping