rpcHandle.sendrecv(message);

            // Create response from RPC message results
            WitnessRegisterResponse response = new WitnessRegisterResponse();
            response.setReturnCode(message.getReturnCode());

            if (message.isSuccess()) {
                // Generate registration ID from context handle
                byte[] contextHandle = message.getContextHandle();

            // Decode WitnessRegister response
            response = new WitnessRegisterResponse();
            response.setRegistrationId(buffer.dec_ndr_string());
            response.setReturnCode(buffer.dec_ndr_long());
        }
        
        public WitnessRegisterResponse getResponse() { return response; }
    }
    
    private static class WitnessUnregisterStub extends DcerpcMessage {