The FreeSWITCH core provides the essential scaffolding: thread management, session control, memory pools, and the event system. It does not know how to speak SIP or play an audio file on its own. Instead, it relies on loaded at runtime.
To interact via Inbound ESL, ensure mod_event_socket is loaded. Below is a sample Python script utilizing the Event Socket interface to track channel creations. freeswitch 18 pdf
show channels : Displays details about every live active phone call. freeswitch 18 pdf