Devin's answer is correct, but the < Number >
verb is always a bit tricky to use.
What you can also do is use the Find Me twimlet, or figure out how to code that twimlet in your app if you chose not to use premade twimlets.
The concept is that it dials up to 10 numbers, one by one. Even if you don't use all 10 numbers, you can enter enough to make sure that the call is eventually answered by a human *no matter what.*
Otherwise, another solution that I used in my Twilio App is before you dial them, you tell them in your verb that if they hit a voicemail, that they don't leave a message there as it WILL NOT be answered. Then, if they press 1 while listening to the phone's voicemail, it will HANG UP (but not disconnect them) they will not leave a message to that voicemail and be redirected to your TwiML.
— You then redirect them to a Voicemail Twimlet —>
where you ask them to leave an email and phone number and Twilio emails you the audio. That way you can answer their concern at a later time.
The TwiML should look like :
< Say > Bla bla dont answer first voicemail < /Say >
< Dial> the rep # < /Dial>
//Depending on answer, if it's missed they exit the Dial verb.
< redirect > "the voicemail url" < /redirect >
(go read the Voicemail page to understand how to customize it to your choosing/business logic.)