| -d | Enable debugging message display. |
| -h | Hang up a possibly open telephone connection on the selected interface. |
| -k | Send the specified string using the keypad facility information element. |
| -n | Dial the specified number on the selected interface. |
| -u | Set the unit number to specify the interface used. |
| -v | Enable verbose result messages for dialling (-n and -w) |
| -w | After dialling (using the -n option), wait for the first result message. |
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