def minmax(self):
        pass
Granting voice sends request to set role to 'participant'.
dataset/ETHPy150Open los-cocos/cocos/cocos/collision_model.py/Cshape.minmax--crossover with--dataset/ETHPy150Open ralphm/wokkel/wokkel/test/test_muc.py/MUCClientProtocolTest.test_grantVoice