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i4b(4)

NAME

     i4b -- isdn4bsd call control ISDN driver

SYNOPSIS

     device "i4b"

DESCRIPTION

     The i4b device driver is used by the isdnd(8) daemon to exchange messages
     with the isdn4bsd kernel part for the purpose of call establishment, con-
     trol and disconnection and to access various control and status informa-
     tions.  The i4b device can only be opened by a single process and is not
     meant to be used by user programs.

     The messages and message parameters are documented in the include file
     /usr/include/machine/i4b_ioctl.h.

     The most important available ioctl's are:

	   I4B_CDID_REQ
		   Request a unique Call Description IDentifier (cdid) which
		   identifies uniquely a single interaction of the local D
		   channel with the exchange.
	   I4B_CONNECT_REQ
		   Actively request a call setup to a remote ISDN subscriber.
	   I4B_CONNECT_RESP
		   Respond to an incoming call, either accept, reject or
		   ignore it.
	   I4B_DISCONNECT_REQ
		   Actively terminate a connection.
	   I4B_CTRL_INFO_REQ
		   Request information about an installed ISDN controller
		   card.
	   I4B_DIALOUT_RESP
		   Give information about call setup to driver who requested
		   dialing out.
	   I4B_TIMEOUT_UPD
		   Update the kernels timeout value(s) in case of dynamically
		   calculated shorthold mode timing changes.
	   I4B_UPDOWN_IND
		   Inform the kernel userland drivers about interface soft
		   up/down status changes.
	   I4B_CTRL_DOWNLOAD
		   Download firmware to active card(s).
	   I4B_ACTIVE_DIAGNOSTIC
		   Return diagnostic information from active cards.

     Status and event messages available from the kernel are:

	   MSG_CONNECT_IND
		   An incoming call from a remote ISDN user is indicated.
	   MSG_CONNECT_ACTIVE_IND
		   After an incoming call has been accepted locally or an out-
		   going call has been accepted by a remote, the exchange sig-
		   naled an active connection and the corresponding B-channel
		   is switched through.
	   MSG_DISCONNECT_IND
		   A call was terminated.
		   Accounting information from a network driver.
	   MSG_CHARGING_IND
		   Charging information from the kernel.

SEE ALSO

     isdnd(8)

AUTHORS

     The i4b device driver and this manpage were written by Hellmuth Michaelis
     <hm@FreeBSD.org>.

FreeBSD 5.4			 July 28, 2002			   FreeBSD 5.4

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