What part of Asterisk 14.0.2 opens the random, high numbered (33094 currently) UDP port? This port is opened even without any channel drivers loaded. $ sudo netstat -ltunp | grep asterisk udp 0 0 0.0.0.0:51488 0.0.0.0:* 13830/asterisk udp 0 0 0.0.0.0:5060 0.0.0.0:* 13830/asterisk udp 0 0 :::42516 :::* 13830/asterisk