Hi, I'm using 0.5.10.4. When I send STUN request, a error (PJLIB_UTIL_ESTUNNOTRESPOND) usually returned. But I'm sure the STUN server has respond to client within 200ms. I use Ethereal to capture network packets. I don't understand why PJSIP usually return (PJLIB_UTIL_ESTUNNOTRESPOND)?