Forward extension to cell phone but keep freepbx voicemail

Is there a way that I can forward my extension to my cellphone, if I do not answer I would like my extensions voicemail to take the message and not my cell phone?

Yes use follow me with call confirmation.

Another way in FMFM is to use the timeout option. Set this timeout to less time than the cell-phone’s default timeout for voicemail. As long as the phone is on, the voicemail will get snagged by the PBX. If the phone is off, however, you will end up in the VM for the cell phone. I don’t know of any other way that can avoid that.