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
displays the currently used sound format for device
/dev/isdntel0.
SEE ALSO
isdntel(4),
isdnd.rc(5),
isdnd(8)
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>.