ISDNTELCTL(8) System Manager's Manual ISDNTELCTL(8)
NAME
isdntelctlcontrol 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>.