I am new to Freeswitch & want to do change voicemail call flow order. For example, when user not available, I need to ask from calling party as "Press1 for leave message or Press 2 for exit."If calling party press 1, then I want to go voicemail call path.

I have some idea regarding lang/en/vm/sounds.xml file but no deep understanding how to change call flow. Pls give some example for doing above requirement.