Asterisk 14.0.2 Opens A High Numbered UDP Port

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Asterisk Users 1 Comment

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

One thought on - Asterisk 14.0.2 Opens A High Numbered UDP Port

  • Those ports are used by the underlying pjproject DNS resolver. The resolver is always listening on those ports for DNS query responses. 1 for IPV4 and 1 for IPV6. Your firewall should only be allowing responses to flow through to those ports that match outgoing requests.