Chapter 9. Controlling FreeSWITCH Externally

The FreeSWITCH Event System is one of the most exciting components of FreeSWITCH. You have already learned how FreeSWITCH operates when it utilizes various static configuration files and scripting languages. The event system allows for tremendous real-time dynamic behavior and control of FreeSWITCH. Utilizing the event system is when FreeSWITCH really comes alive.

The event system allows external software programs to act as listeners regarding activity happening on the system. This allows for real-time interaction with telephony operations on the telephony softswitch in conjunction with externally running software or hardware. Almost everything that happens within the FreeSWITCH system causes some sort of event message to be generated. These events can be watched by external entities. This is similar to the publish/subscribe (or "pub-sub") system used by common message queuing software solutions, although it is specifically tailored for FreeSWITCH...