These feature bits allow a hotel, motel, or telephone answering service (TAS) operator to set up mailboxes for a guest or client by recording a name or greeting, setting a passcode, or activating the tutorial. The operator can also clear messages after a guest or client leaves.
| Bit | Description | Required | Incompatible |
| 008 | Mailbox can be checked in/out | ||
| 090 | Check in other mailboxes | 008 | |
| 091 | Check out other mailboxes | 008 |