Which two explanations of DTMF dialing are true?
Which two explanations of DTMF dialing are true? (Choose two.)
A. DTMF dialing consists of simultaneous voice-band tones generated when a button is pressed on a telephone.
B. The use of DTMF enables support for advanced telephony services.
C. DTMF dialing uses INVITE messages to signal when the first digit is pressed in a new call.
D. DTMF dialing consists of a simultaneous digital-band pulse generated when a button is pressed on a telephone.
Correct Answer: AB