Asterisk course

Dialplan

extensions.conf: contexts, priorities, and Dial().

[from-internal]
exten => 100,1,NoOp(calling desk phone)
same => n,Dial(PJSIP/100,20)
same => n,Hangup()

A context is a namespace. The phone’s endpoint should land in from-internal. Priority 1 runs first; same => n continues. Dial() rings the endpoint. When you change the file, dialplan reload in the CLI.