What DN does AA use when the call is connected to the phone, is it the enterprise or cell phone number? If it's the later then it workes as designed, at least as designed from CUCM 7.0 and 8.x. From 9.0 this has changed, see below.
Cisco Mobility Updates
Simultaneous Ring in previous versions of CUCM
- CUCM 7.0 introduced the parameter “Reroute Remote Destination Calls to Enterprise Number”
- Calls direct to cell would ignore time of day settings and call the cell
- Calls would be anchor on the enterprise phone….but the line would not ring
New features in CUCM 9.0:
- Added “Ring All Shared Lines” service parameter
- Uses Boolean Setting
- True – all lines (including other remote destinations) ring
- False – only the dialed number (remote destination) rings
- Default and existing behavior is False
