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NAO Voice Reognition

Hi, I am looking into making our NAO robot understand voice recognition commands. Using choreograph, this works, but we want to receive the commands inside our python node, so we can integrate it with the code we currently have.

Using "rostopic echo word_recognized" doesn't do anything while choreograph returns word.

I have also tried to start the voice recognition from the command line with "rosservice call start_recognition" but all i get is an error "empty vocabulary". And i dont know how to add the vocabulary.

Also any other suggestions, using just the microphone, and a separate voice recognition software would work.

I hope someone can help me, thx in advance