1998-12-27 21:47:14 +00:00
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.\"
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1999-03-07 16:12:47 +00:00
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.\" Copyright (c) 1997, 1999 Hellmuth Michaelis. All rights reserved.
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1998-12-27 21:47:14 +00:00
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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1999-03-07 16:12:47 +00:00
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.\" $Id: isdntelctl.8,v 1.6 1999/02/16 10:40:18 hm Exp $
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1998-12-27 21:47:14 +00:00
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.\"
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1999-03-07 16:12:47 +00:00
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.\" last edit-date: [Sun Feb 14 10:20:38 1999]
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1998-12-27 21:47:14 +00:00
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.\"
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.Dd December 14, 1998
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.Dt isdntelctl 8
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.Sh NAME
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.Nm isdntelctl
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.Nd control isdn4bsd telephone sound format conversion
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.Sh SYNOPSIS
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.Nm
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.Op Fl c
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.Op Fl g
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.Op Fl u Ar unit
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.Op Fl A
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.Op Fl U
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1999-03-07 16:12:47 +00:00
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.Op Fl R
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1998-12-27 21:47:14 +00:00
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.Sh DESCRIPTION
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.Nm isdntelctl
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is part of the isdn4bsd package and is used to configure the sound format
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conversion facilities of the /dev/i4btel interfaces.
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.Pp
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The following options are available:
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.Bl -tag -width Ds
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.It Fl c
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Clear the telephone input queue.
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.It Fl g
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Get the sound format currently in use.
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.It Fl u
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Set the /dev/i4btel unit number. The default value is zero to access
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device /dev/i4btel0.
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.It Fl A
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Set sound format to A-Law.
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.It Fl U
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Set sound format to u-Law.
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.It Fl R
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Set sound format to canonical (regular) A-Law format.
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.El
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.Pp
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By default, isdn4bsd sends and receives audio in A-Law as provided by the
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hardware. However, these samples cannot easily be processed further as the
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sample word is bit-reversed. Both the u-Law and canonical A-Law formats
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store samples in a way suitable for post-processing by e.\ g. sox(1).
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1998-12-27 21:47:14 +00:00
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.Pp
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.Sh FILES
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/dev/i4btel<n>
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.Sh STANDARDS
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A-Law and u-Law are specified in ITU Recommendation G.711.
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.Sh EXAMPLES
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The command:
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.Bd -literal -offset indent
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isdntelctl -g
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.Ed
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.Pp
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displays the currently used sound format for device /dev/i4btel0.
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.Sh AUTHOR
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The
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.Nm
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utility and this manpage were written by Hellmuth Michaelis. He can be
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contacted at hm@kts.org.
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