When combined by the Linux SNMPTT package, it can be converted into an SNMP Trap and Inform receiver and notification engine as the SNMPTT tool will receive SNMP Traps and Informs and convert them into Syslog messages on your log server.
Cacti itself doesn't use SNMP Traps, there was a plugin that did at one point, but I am unsure if its been updated to work with the latest Cacti. Cacti itself will use SNMP to monitor/graph the device and links, and then the thold plugin can do alerts
It provides Email, Syslog, and SNMP Trap or Inform escalations. In addition, it also can notify personnel of Cacti Device status changes through Email, Syslog, and either SNMP Trap or Inform.
