isdn(4) [netbsd man page]

ISDN(4) 						   BSD Kernel Interfaces Manual 						   ISDN(4)

NAME

     isdn -- ISDN kernel to userland master device

SYNOPSIS

     pseudo-device isdn

DESCRIPTION

     The isdn device driver is used by the isdnd(8) daemon to exchange messages with the ISDN kernel part for the purpose of call establishment,
     control and disconnection and to access various control and status information.

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

     The 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 isdn device driver and this man page were written by Hellmuth Michaelis <hm@kts.org>.

BSD
								 February 3, 1998							       BSD

ISDNTEL(4)						   BSD Kernel Interfaces Manual 						ISDNTEL(4)

NAME

     isdntel -- ISDN B-channel telephony interface driver

SYNOPSIS

     pseudo-device isdntel count

DESCRIPTION

     The isdntel driver provides an interface to the B-channel for telephony applications and is currently used by the isdnd(8) for answering
     machine support. The driver is part of the isdn4bsd package.

     The lower six bits of the driver's minor number are used to specify a unit number, whereas the upper two bits specify a functionality.

     Functionality zero is the usual telephony data stream i/o driver.

     Functionality one is used to enable commands to dial out and hang up and receive responses about the state of the dial out progress and sta-
     tus.  This commands may change in the future, for details see the file /usr/include/netisdn/i4b_tel_ioctl.h and the isdntel(8) utility.

     The telephony data stream comes out of the line in a bit-reversed format, so the isdntel driver does the bit-reversion process in any case.

     Additionally, the user can specify to do A-law to mu-law, mu-law to A-law or no conversion at all in the isdntel driver by using the
     isdntelctl(8) utility.

     The driver is able to process several ioctl's:

	   I4B_TEL_GETAUDIOFMT
		   get currently used audio format conversion.
	   I4B_TEL_SETAUDIOFMT
		   set currently used audio format conversion.
	   I4B_TEL_EMPTYINPUTQUEUE
		   clear the input queue.

     For the I4B_TEL_GETAUDIOFMT and I4B_TEL_SETAUDIOFMT, the following parameters are available:

	   CVT_NONE
		   do no A-law/mu-law audio format conversion. The conversion path looks like this:

		   USER <--> bitreversing <--> ISDN-line

	   CVT_ALAW2ULAW
		   set audio format conversion to do an audio conversion from A-law (on the ISDN line) to mu-law (in the userland).  The read(2)
		   conversion path looks like this:

		   USER <-- mu-law/A-law <-- bitreversing <-- ISDN-line

		   and the write(2) conversion path looks like this:

		   USER --> mu-law/A-law --> bitreversing --> ISDN-line

	   CVT_ULAW2ALAW
		   set audio format conversion to do an audio conversion from mu-law (on the ISDN line) to A-law (in the userland).  The read(2)
		   conversion path looks like this:

		   USER <-- A-law/mu-law <-- bitreversing <-- ISDN-line

		   and the write(2) conversion path looks like this:

		   USER --> A-law/mu-law --> bitreversing --> ISDN-line

SEE ALSO

     isdnd.rc(5), isdnd(8), isdntel(8), isdntelctl(8)

STANDARDS

     A-law and mu-law are specified in ITU Recommendation G.711.

AUTHORS

     The isdntel device driver and this man page were written by Hellmuth Michaelis <hm@kts.org>.

BSD
								  April 21, 1999							       BSD