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+.\"
+.\" Copyright (c) 1997, 1998 Hellmuth Michaelis. All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	$Id: isdntest.8,v 1.6 1998/12/16 13:39:47 hm Exp $
+.\"
+.\"	last edit-date: [Sat Dec  5 18:17:35 1998]
+.\"
+.Dd July 9, 1998
+.Dt isdntest 8
+.Sh NAME
+.Nm isdntest
+.Nd isdn4bsd debugging and verification tool
+.Sh SYNOPSIS
+.Nm
+.Op Fl c Ar unit
+.Op Fl h
+.Op Fl i Ar number
+.Op Fl o Ar number
+.Op Fl w
+.Sh DESCRIPTION
+.Nm isdntest
+is part of the isdn4bsd package and may be used as a stimulation tool
+for debugging the isdn4bsd kernel functionality.
+.Pp
+NOTE: 
+.Nm Isdntest
+must be run
+.Em instead
+of the
+.Xr isdnd 8
+daemon and can not be used while the daemon runs.
+.Pp
+The following options are available:
+.Bl -tag -width Ds
+.It Fl c
+Use controller unit number for test.
+.It Fl h
+Use HDLC as the B channel layer 1 protocol instead of no protocol.
+.It Fl i
+Use number to verify the incoming number.
+.It Fl o
+Use number as the outgoing number to dial.
+.It Fl w
+Wait for keyboard input for terminating the call.
+.El
+.Pp
+The
+.Nm
+utility is currently of not much use for end users, it is primarily a debugging
+tool for development and is part of the release in the hope, that someone
+enhances it as a real self test and setup-verification tool!
+.Pp
+.Nm Isdntest 
+does almost no error checking and error recovery, so unexpected
+hangs or crashes may occur.
+
+.Sh EXAMPLES
+For the following example, it is assumed that a machine with isdn4bsd 
+installed is connected to an S0 bus and that one of the valid MSN's (MSN = Multiple Subscriber Number
+= telephone number) on this bus is
+.Em 42 .
+The 
+.Xr isdnd 8
+.Em must
+not currently running on that machine! Executing:
+.Bd -literal -offset indent
+isdntest -i 42 -o 42
+.Ed
+.Pp
+will setup an outgoing call from that machine to itself, connect to itself
+and disconnect after 5 seconds.
+.Nm Isdntest
+has to be finished by the user by entering Control-C.
+.Pp
+.Sh FILES
+/dev/i4b
+
+.Sh AUTHOR
+The
+.Nm
+utility and this manpage were written by Hellmuth Michaelis. He can be
+contacted at hm@kts.org.