NAME
isdntelctl —
control isdn4bsd telephone sound format
conversion
SYNOPSIS
isdntelctl |
[-c] [-g]
[-u unit]
[-A] [-U]
[-N] |
DESCRIPTION
isdntelctl is part of the isdn4bsd package and is used
to configure the sound format conversion facilities of the /dev/isdntel
interfaces.
The following options are available:
-c- Clear the telephone input queue.
-g- Get the sound format currently in use.
-u- Set the /dev/isdntel unit number. The default value is zero to access device /dev/isdntel0.
-A- Do A-law (ISDN line) -> mu-law (userland) conversion.
-U- Do mu-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 isdntel(4) driver does the bit-reversion process in any case.
Additionally, the user can specify to do A-law to mu-law, mu-law
to A-law or no conversion at all in the isdntel driver by using the
isdntelctl utility.
FILES
/dev/isdntel<n>
EXAMPLES
The command
isdntelctl -g
displays the currently used sound format for device /dev/isdntel0.
SEE ALSO
STANDARDS
A-law and mu-law are specified in ITU Recommendation G.711.
AUTHORS
The isdntelctl utility and this man page
were written by Hellmuth Michaelis
<hm@kts.org>.