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ISDNTELCTL(8)             BSD System Manager's Manual            ISDNTELCTL(8)

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 <hmATkts.org>.

BSD                             April 21, 1999                             BSD