Using AMI (Asterisk Manager Interface) to control Asterisk from an external program.
Using AGI (Asterisk Gateway Interface) to execute external scripts and connect Asterisk to external APIs.
Troubleshooting Asterisk system.
Effective use of Asterisk features, such as call parking, audio conferencing, and DTMF feature codes.
Call monitoring and recording;
Theory of Analog telephony, and how to connect Asterisk to the PSTN.
Digital telephony using T1s and E1s.
SIP and IAX protocols