Call Forward to Misc Dest and then to voicemail

General Help
1

Hi Guys,
I am using FreePBX 2.11.0.37 I setup the MISC Destination to forward my DID to the cell number its working fine but what I need to do if the cell is not answered or busy I need to route the call back to voicemail.
Please let me know how can I achieve this.

2

Followme