8.13.2.2. Restrictions 
- When parameter TWINNING is changed from YES to NO in AMO KCSU, the extension number on the phone displays are updated only when the phone idle display is shown / updated.
- The master device (CMI) has exactly 1 line (its own prime line) configured.
- The slave device has exactly 2 lines configured (its own prime line and the prime line of the CMI as a secondary line).
- Allthough the CMI is used as a keyset there are no line keys supported for that device. The CMI devices which are being used are S2-SL2 and S3-SL3. There is only one CMI allowed for a Personal Device Group group.
- Attendant is not supported by the Personal Device Group feature.
- All members of the Personal Device Group configuration must be assigned to the same WABE group.
- All members must be in the same switch. It is not possible to combine a desktop phone of one switch with a CMI configured in a different switch.
- Some menu items are handled different on desktop phone and CMI.
- One device can only be in one Personal Device Group group.
- No other keysets may be combined with the Personal Device Group group.