Thank you for the response, I using

iif([DialerType].CurrentMember IS [DialerType].[Dialer Type Code].&[2180], some value, other value)

Works also, and your's also works, but the way I am new to MDX, do you know something on MDX like T-SQL does case statement, I can have at least three values to evaluate, the IIF only works for two sets of value.

Thank you for the response, I am very appriciate.