Unconditional voicemail forwarding and user feedback

Hi,

  1. Which feature code to dial, to tell a freePBX 2.10-enabled asterisk 1.8 system to unconditionally forward calls aiming your extension to your voicemail ?
    *72 + ?

  2. What is suggested to give SIP phones users a feedback (and a reminder) when their extension is forwarded ?
    Use a BLF ?
    Send a text message to the device ?

Regards