If the phone is forwarded/rerouted in a no answer condition then the CFNA timer determines when the call gets forwarded. If you have a Call Reroute 2nd programmed then the Answer Plus rerout timer determines when the call routes to that destination. If that timer in the phones COS is 0 then the system reroute timer controls when the call routes to the 2nd destination. Again, you have to check the options in all of the devices involved, phones and trunks.