Name

ISDN (Integrated Services Digital Network address—experimental)

Textual representation:

                     owner ttl class ISDN ISDN-address sa

Example:

delay.hp.com.    IN  ISDN  141555514539488
hep.hp.com.      IN  ISDN  141555514539488 004

Binary representation:

ISDN type code: 20
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    /                 ISDN ADDRESS                  /
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    /                  SUBADDRESS                   /
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

where:

ISDN ADDRESS

A character-string that identifies the ISDN number of owner and DDI (Direct Dial In), if any.

SUBADDRESS

An optional character-string specifying the subaddress.

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