Process for converting the E.164 number

Last Updated : Mar 08, 2016 |
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When a user dials an E.164 number, ENUM constructs an Application Unique String (AUS) from the number by removing all non-digit characters except the plus sign (+). For example, for the dialed number +44-207-946-0148, the AUS is +442079460148.
The AUS is then converted to an initial key, which is a Fully Qualified Domain Name (FQDN), by using the following steps:
  1. Remove the leading plus sign (+) from the AUS.
  2. Reverse the order of digits and insert dots between the digits. For example, the number 442079460148 is changed to 8.4.1.0.6.4.9.7.0.2.4.4.
  3. Append the string .e164.arpa to change the number to a domain name. For example, 8.4.1.0.6.4.9.7.0.2.4.4.e164.arpa.
The domain name is then used to request NAPTR records. The NAPTR records might contain the end result or the NAPTR records generate a new key to request further NAPTR records from the DNS. At the end of this process, a SIP URI is generated, that Avaya SBC uses to update the request URI, and proceeds with the routing. If a routing entry is not configured in the corresponding routing profile, Avaya SBC uses this URI to determine the destination.
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