NAME
isdntelctl — control isdn4bsd telephone sound format conversion
SYNOPSIS
isdntelctl [−c] [−g] [−u unit] [−A] [−U] [−N]
DESCRIPTION
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:
−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.
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.
FILES
/dev/i4btel<n>
STANDARDS
A-Law and u-Law are specified in ITU Recommendation G.711.
EXAMPLES
The command:
isdntelctl -g
displays the currently used sound format for device /dev/i4btel0.
SEE ALSO
g711conv(1), i4btel(4), isdnd.rc(5), isdnd(8)
AUTHORS
The isdntelctl utility and this manpage were written by Hellmuth Michaelis <hm [AT] kts.org>.
BSD April 21, 1999 BSD