Say a given character string, returning early if any of the given DTMF digits are received on the channel.
Returns 0 if playback completes without a digit being pressed, or the ASCII numerical value of the digit if one was pressed or -1 on error/hangup.

public class SayAlphaCommand : AGICommand

Public Class SayAlphaCommand
	Inherits AGICommand

public ref class SayAlphaCommand : public AGICommand

type SayAlphaCommand =  
    class
        inherit AGICommand
    end