The OpenNET Project / Index page

[ новости /+++ | форум | теги | ]

Интерактивная система просмотра системных руководств (man-ов)

 ТемаНаборКатегория 
 
 [Cписок руководств | Печать]

i4btel (4)
  • >> i4btel (4) ( FreeBSD man: Специальные файлы /dev/* )

  • BSD mandoc
     

    NAME

    
    
    i4btel
    
     - isdn4bsd ISDN B-channel telephony interface driver
    
     
    

    SYNOPSIS

    device i4btel [count]  

    DESCRIPTION

    The driver provides an interface to the ISDN 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 drivers's minor number is 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 i4b_tel_ioctl.h and the isdnphone(8) utility.

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

    Additionally, the user can specify to do A-law to u-law, u-law to A-law or no conversion at all in the i4btel 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/u-law audio format conversion. The conversion path looks like this:

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

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

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

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

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

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

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

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

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

     

    SEE ALSO

    g711conv(1), isdnd.rc5, isdnd(8), isdnphone(8), isdntelctl(8)  

    STANDARDS

    A-Law and u-Law are specified in ITU Recommendation G.711.  

    AUTHORS

    The device driver and this manpage were written by An Hellmuth Michaelis Aq [email protected] .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    SEE ALSO
    STANDARDS
    AUTHORS


    Поиск по тексту MAN-ов: 




    Партнёры:
    PostgresPro
    Inferno Solutions
    Hosting by Hoster.ru
    Хостинг:

    Закладки на сайте
    Проследить за страницей
    Created 1996-2024 by Maxim Chirkov
    Добавить, Поддержать, Вебмастеру