DTMF? What is that ?
DTMF (Dual-Tone Multi-Frequency) signaling is a system by which audible tones are used to represent buttons on a keypad.
DTMF codes are used here to build interactive voice servers (IVR).
"To contact the order department, type 1 - to contact the delivery department, type 2..."
To use this action, we invite you to contact the support department, which can assist you in setting up your IVS.