I4B(4) MidnightBSD Kernel Interfaces Manual 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, 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/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 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〉.

MidnightBSD 0.3 July 28, 2002 MidnightBSD 0.3