Use Set() for variable assignment, string slicing, and pattern-based digit manipulation in Asterisk dialplans.
Ring external cell phones through Local channels while preserving the original inbound DID
Use Progress() to send early media (183 Session Progress) to the caller -- play audio before formally answering the call, useful for custom ringback t...
A centralized Gosub that handles DND, call forward, follow-me, and DIALSTATUS for any extension