public function telephonyCallManager($phone, $details)
    {
        if (!isset($phone)) {
            throw new \InvalidArgumentException('Phone number must be set');
        }

        $parameters['phone'] = $phone;
        $parameters['details'] = isset($details) ? $details : 0;

        /* @noinspection PhpUndefinedMethodInspection */
        return $this->client->makeRequest(
            '/telephony/manager',
            "GET",
            $parameters
        );
    }