-c | Clear the telephone input queue. |
-g | Get the sound format currently in use. |
-u | Set the /dev/i4btel unit number. The default value is zero to access device /dev/i4btel0. |
-A | Do A-law (ISDN line) -> u-law (userland) conversion. |
-U | Do u-law (ISDN line) -> A-law (userland) conversion. |
-N | Set sound conversion to do no format conversion. |
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