I just bought an 09 Jag XF Premium Luxury Sedan and as I drove off of the lot I tried to call my salesman via my Bluetooth docked Galaxy Note 5 via voice control.
The voice control system states "No voice heard". All settings and they seem to be correct. The blogs I've been reading state that Jaguar has been disabling the voice control and you have to request to have it reactivated.

https://www.jaguarforums.com/forum/xf-xfr-x250-44/new-xf-press-jaguarvoice-button-nothing-51577/