Yes, you can.
A short video:
By using the App Builder, you can build your own custom call flow. You can use the "Hangup" Applet or command at any point you want to terminate a call flow.
However, you cannot terminate the call or change the call flow of the person on the other end of your phone.
If you have any questions or concerns, please connect with us using the chat widget on your Exotel Dashboard or Whatsapp us on 08088919888.