OID value: 2.5.13.21
OID description:
The Telephone Number Substrings Match
rule determines if a presented substring is a substring
of an attribute value of type
PrintableString which is a telephone number.
The rules for matching are identical to those for caseExactSubstringsMatch, except that all space and "-" characters are skipped during the comparison.
telephoneNumberSubstringsMatch MATCHING-RULE ::= { SYNTAX SubstringAssertion ID id-mr-telephoneNumberSubstringsMatch }
See also the OID Repository website reference for 2.5.13.21