tapicfg makedefault
Sets the default TAPI application directory partition for the domain. Windows commands reference
On Windows
Windows
tapicfg makedefault /directory:<partitionname> [/domain:<domainname>]
makedefault /directory:<partitionname>Required. Specifies the DNS name of the TAPI application directory partition set as the default partition for the domain. This name must be a fully-qualified domain name./domain<domainname>: Specifies the DNS name of the domain for which the TAPI application directory partition is set as the default. If the domain name is not specified, the name of the local domain is used./?Displays help at the command prompt.