makedefault /directory:Partition_Name /Domain:Domain_Name /directory Specifies the DNS name of the TAPI Directory to be made ...

makedefault /directory:Partition_Name [/Domain:Domain_Name]
            /directory     Specifies the DNS name of the TAPI Directory to be
                           made the default TAPI directory.
            /Domain        Specifies the DNS name of the domain for
                           which the given NC is to be made the
                           default TAPI directory. If not specified
                           then the local domain is assumed.
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