ISDN-Records (ISDN address)
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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.
