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The QueryHomeServer function returns the fully qualified domain name of the home server for a specified SIP user.
string QueryHomeServer( string userAtHost );
A SIP user as a string of the form "firstname.lastname@example.org" whose home server will be returned.
Returns either the FQDN (fully qualified domain name) of the specified Standard Edition home server, or the name of the Enterprise Edition pool. If the user is not in the registrar database, returns null.