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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,
     control and disconnection and to access various control and status
     informations.  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/i4b/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
                   outgoing call has been accepted by a remote, the exchange
                   signaled an active connection and the corresponding B-
                   channel is switched through.
           MSG_DISCONNECT_IND
                   A call was terminated.
           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).
           MSG_IDLE_TIMEOUT_IND
                   A call was terminated by the isdn4bsd kernel driver because
                   a B-channel idle timeout occurred.
           MSG_ACCT_IND
                   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〉.