public function sendStartChannelOperation($channel)
    {
        $channelId = Utilities::getEntityId(
            $channel,
            'WindowsAzure\MediaServices\Models\Channel'
        );
        $headers = [
            Resources::CONTENT_TYPE => Resources::JSON_CONTENT_TYPE,
        ];

        return $this->_sendOperation(
            null,
            "Channels('{$channelId}')/Start",
            Resources::HTTP_POST,
            Resources::STATUS_ACCEPTED,
            $headers);
    }