You indicated the Signal Processing Toolbox, so in that regard, see if the invfreqz function will do what you want.
Beyond that, the idfrd function in the System Identification Toolbox would likely be appropriate. If you have the SIT, start there and follow the links.
Those functions will identify the parameters, however it will be necessary to use circuit synthesis techniques (Foster or Cauer or other approaches) to actually build an equivalent active or passive circuit from them. That is definitely not trivial.
