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-.\"
-.\" Copyright (c) 1997, 2002 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.
-.\"
-.\" $FreeBSD$
-.\"
-.\"	last edit-date: [Sun Jul 28 12:07:13 2002]
-.\"
-.Dd July 5, 2007
-.Dt I4B 4
-.Os
-.Sh NAME
-.Nm i4b
-.Nd isdn4bsd call control ISDN driver
-.Sh SYNOPSIS
-.Cd device \&"i4b\&"
-.Sh DESCRIPTION
-The
-.Nm
-device driver is used by the
-.Xr isdnd 8
-daemon to exchange messages with the isdn4bsd kernel part for the purpose
-of call establishment, control and disconnection and to access various
-control and status informations.
-The
-.Nm
-device can only be opened by a single process and is not meant to be used
-by user programs.
-.Pp
-The messages and message parameters are documented in the include
-file
-.Em /usr/include/i4b/i4b_ioctl.h .
-.Pp
-The most important available ioctl's are:
-.Pp
-.Bl -tag -width Ds -compact -offset indent
-.It Ar I4B_CDID_REQ
-Request a unique Call Description IDentifier (cdid) which identifies
-uniquely a single interaction of the local D channel with the exchange.
-.It Ar I4B_CONNECT_REQ
-Actively request a call setup to a remote ISDN subscriber.
-.It Ar I4B_CONNECT_RESP
-Respond to an incoming call, either accept, reject or ignore it.
-.It Ar I4B_DISCONNECT_REQ
-Actively terminate a connection.
-.It Ar I4B_CTRL_INFO_REQ
-Request information about an installed ISDN controller card.
-.It Ar I4B_DIALOUT_RESP
-Give information about call setup to driver who requested dialing out.
-.It Ar I4B_TIMEOUT_UPD
-Update the kernels timeout value(s) in case of dynamically calculated
-shorthold mode timing changes.
-.It Ar I4B_UPDOWN_IND
-Inform the kernel userland drivers about interface soft up/down status
-changes.
-.It Ar I4B_CTRL_DOWNLOAD
-Download firmware to active card(s).
-.It Ar I4B_ACTIVE_DIAGNOSTIC
-Return diagnostic information from active cards.
-.El
-.Pp
-Status and event messages available from the kernel are:
-.Pp
-.Bl -tag -width Ds -compact -offset indent
-.It Ar MSG_CONNECT_IND
-An incoming call from a remote ISDN user is indicated.
-.It Ar MSG_CONNECT_ACTIVE_IND
-After an incoming call has been accepted locally or an outgoing call has
-been accepted by a remote, the exchange signaled an active connection
-and the corresponding B-channel is switched through.
-.It Ar MSG_DISCONNECT_IND
-A call was terminated.
-.It Ar MSG_DIALOUT_IND
-A userland interface driver requests the daemon to dial out (typically a
-network interface when a packet arrives in its send queue).
-.It Ar MSG_IDLE_TIMEOUT_IND
-A call was terminated by the isdn4bsd kernel driver because a B-channel
-idle timeout occurred.
-.It Ar MSG_ACCT_IND
-Accounting information from a network driver.
-.It Ar MSG_CHARGING_IND
-Charging information from the kernel.
-.El
-.Sh SEE ALSO
-.Xr isdnd 8
-.Sh AUTHORS
-The
-.Nm
-device driver and this manpage were written by
-.An Hellmuth Michaelis Aq hm@FreeBSD.org .