OID value: 2.5.4.25
OID description:
The International ISDN Number
attribute type specifies
an International ISDN Number associated with an object.
An attribute value for International ISDN Number is a string which complies with the internationally agreed format for ISDN addresses given in CCITT Rec. E.164.
internationalISDNNumber ATTRIBUTE ::= { WITH SYNTAX NumericString (SIZE(1..ub-international-isdn-number)) EQUALITY MATCHING RULE numericStringMatch SUBSTRINGS MATCHING RULE numericStringSubstringsMatch ID id-at-internationalISDNNumber }
See also the OID Repository website reference for 2.5.4.25