The Address Book Name Service Provider Interface (NSPI) Referral Protocol defines a remote procedure call (RPC) service that supplies a caller with the name of an NSPI server. Additionally, this protocol can return the Domain Name System (DNS)fully qualified domain name (FQDN) (1) of a mailbox server, given the distinguished name (DN) (1) of that server.
Sections 1.8, 2, and 3 of this specification are normative and can contain the terms MAY, SHOULD, MUST, MUST NOT, and SHOULD NOT as defined in RFC 2119. Sections 1.5 and 1.9 are also normative but cannot contain those terms. All other sections and examples in this specification are informative.