The ISDN-record maps a domain name to an ISDN (Integrated Services Digital Network) telephone number.

 

The ISDN phone numbers / DDI (Direct Dial In) used should follow ITU-T E.163/E.164 international telephone numbering standards.

For example: 12121234567 ( 1=USA, 212=Manhattan New York area code, 1234567=number)

 

The ISDN sub-address is an optional hexadecimal number.

 

To create a new ISDN-record, right-click a zone in the left list in the DNS Records window, and select "Other new record" from the pop-up menu.

 

This record type is defined in RFC1183.