ISDNTELCTL(8) MidnightBSD System Manager’s Manual ISDNTELCTL(8)
isdntelctl — control isdn4bsd telephone sound format conversion
isdntelctl [−c] [−g] [−u unit] [−A] [−U] [−N]
The isdntelctl utility is part of the isdn4bsd package and is used to configure the sound format conversion facilities of the /dev/i4btel interfaces.
The following options are available:
Clear the telephone input queue.
Get the sound format currently in use.
Set the /dev/i4btel unit number. The default value is zero to access device /dev/i4btel0.
Do A-law (ISDN line) -> u-law (userland) conversion.
Do u-law (ISDN line) -> A-law (userland) conversion.
Set sound conversion to do no format conversion.
The telephony data stream comes out of the line in a bit-reversed format, so the i4btel(4) driver does the bit-reversion process in any case.
Additionally, the user can specify to do A-law to u-law, u-law to A-law or no conversion at all in the i4btel driver by using the isdntelctl utility.
displays the currently used sound format for device /dev/i4btel0.
g711conv(1), i4btel(4), isdnd.rc(5), isdnd(8)
A-Law and u-Law are specified in ITU Recommendation G.711.
The isdntelctl utility and this manpage were written by Hellmuth Michaelis 〈email@example.com〉.
MidnightBSD 0.3 April 21, 1999 MidnightBSD 0.3