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NetBSD 6.1.5 - man page for isdntel (netbsd section 4)

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 status.  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


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