public function dial($number = null, $attributes = array()) {
        return $this->nest(new Voice\Dial($number, $attributes));
    }
public function dial($number = null, $attributes = array()) {
        return $this->nest(new Voice\Dial($number, $attributes));
    }
public function dial ( $ number = null , $ attributes = array ( ) ) { return $ this -> nest ( new Voice \ Dial ( $ number , $ attributes ) ) ; }
Add Dial child.

@param string $number Phone number to dial
@param array $attributes Optional attributes
@return TwiML Child element.
Add Dial child .