Signalling & Call Set-up

Signalling and Call set-up There are three types of Signalling: 1) Supervisory: On-hook, off-hook, Ringing 2) Address: Communicates the digits that were dialed like DTMF (Dual tome multi frequency) and Pulse dialing 3)Informational: Dial-tone, ring-back tone, recorder tone. Call set-up: 1.The calling phone goes off-hook, closing the circuit to the local CO switch. 2. TheContinue reading “Signalling & Call Set-up”