Does Twilio Provide any Voicemail Interaction Results?

I understand how to make twilio interface with an answering machine/voicemail (Twilio will wait for the "beep" before proceeding).

However, does twilio know when a voicemail hangs up or when the automated attendant comes back on to say that the message length has been exceeded. For example, if I have a 1 minute message playing into a voicemail that only permits 30 second messages, does twilio know what to do here, or give me as the developer any control over what happens?

Some possible options would be:

1.) Simple Automated attendant detection (detect the automated attendant's audio -- nothing intelligent, just that the attendant is making noise-- and allow the programmer to either terminate the call, or press more buttons, etc).

2.) An indicator in the API that says only a portion of the message was actually played (with the number of seconds played) so that twilio could call back and leave the 2nd portion of the message.

Thanks for any pointers here....