ServiceModel.DuplexClientBase<T> missing in .net portable subset

Question

I've tried to make a wcf service referecne to a net.tcp duplex from a portable class library (VS2012). The generated code refers to some classes of System.ServiceModel wich are not included in the .net portable subset (for eg: System.ServiceModel.DuplexClientBase).

Is there a way to get wcf duplex channel work in a portable class library? or is it just not supported by now?

thanks!