PAGI\Client\IClient::getFullVariable PHP Method

    public function getFullVariable($name, $channel = false);

 /**
  * Access AGI client to get the variables.
  *
  * @param string $name Variable name.
  *
  * @return string
  */
 protected function getCallerIdVariable($name)
 {
     return $this->_client->getFullVariable('CALLERID(' . $name . ')');
 }