Can those services that require interaction be tricked by hacking the voicemail and recording a message with touch tones in them? Fortunately, most that require

Can those services that require interaction be tricked by hacking the voicemail and recording a message with touch tones in them? Fortunately, most that require # also use it in voicemail greeting recording to end the recording, but the example, there are some that require any key, which probably is vulnerable.