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.
A and B are correct.
A mentions voice, DTMF cannot mimic voice. C is wrong because DTMF does not send invite messages. That just leaves B and D.
wrong correct answer is B & D.
Ahmad, can you explain why you think D is correct? DTMF is tone generated not pulse generated.