'Constructs a MessageContext
:param sid: The sid
:returns: twilio.rest.chat.v2.service.channel.message.MessageContext
:rtype: twilio.rest.chat.v2.service.channel.message.MessageContext'

def __call__(self, sid):

    return MessageContext(self._version, service_sid=self._solution['service_sid'], channel_sid=self._solution['channel_sid'], sid=sid)
