Call forward unconditional is not working when sip is not register

hi,in freepbx call forwarding unconditional in user portal is not working when sip is not registered .it will not forward incoming call to mobile number mentioned in call forwarding in user portal,i tried using follow me settings also. call is routing to mobile only when any one sip extension is registered. please help.

Try a ring group containing your extension and your mobile number instead.

thank you its working