The H.323 ALG is supported in NAPT-44 rules and IPv4 stateful-firewall rules. H.323 is a legacy VoIP protocol.
To configure H.323 in a NAPT-44 rule, include the application-sets junos-h323-suite statement at the [edit services nat rule rule-name term term-name from] hierarchy level. To configure H.323 in a stateful-firewall rule, include the application-sets junos-h323-suite statement at the [edit services stateful-firewall rule rule-name term term-name from] hierarchy level.
To show H.323 ALG statistics, issue the show services alg statistics application-protocol h323 command.