Please consider enabling two features in 3CX app: "default" phone. For users with multiple devices, as well as multiple locations/workstations. Example: User has 2 locations (work & home). Work location has T48 & CP860. Home has T48. Enable ability of work location to default to preferred phone for that workstation (i.e., T48 at 192.168.10.x), and home location to default to preferred phone for home workstation (i.e., T48 @ 10.0.1.x). On the same subject, allow user to re-select / change device associated with their 3CX app.