Transferring straight to VM using the Blf's

I currently am experiencing issues with using *, then the blf for an extension to go straight to VM. When I do this it just rings like a normail call. I am running FreePBX 2.3.1.0 with 21 Aastra 9133i phones with the latest firmware release and each setup with their own Blf’s. We did not have this issue until last week when we updated to the new FreePBX software. Can someone please help!!!