Pulse dialing and dual-tone multi-frequency dialing (tone dialing) are the two methods used in telephone signaling to recognize the dialed number. Pulse dialing uses different signal pulses to indicate the phone number dialed by a caller, while DTMF dialing uses specific tones to indicate the number. Since the introduction of DTMF, pulse dialing has lost its significance. Tone dialing has now become the standard for telephone companies worldwide.