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       ttyI[0-63] are emulated tty devices of the Linux ISDN sub­
       system.  These devices can be used in the same way as  the
       traditional  serial  devices  ttySx.   The  official major
       device numbers are 43 for ttyI .  The minor device numbers
       start with 0 and end with 63.

       The  ISDN  tty devices are equipped with a modem emulation
       implementing a set of traditional and some special AT com­
       mands.  This  provides  easy  use together with almost all
       communication software that  uses  modem  commands:  mini­
       com(1),  seyon(1), XCept(1), uucico(8), mgetty(8), dip(8),
       pppd(8) and more. When enabled  during  kernel  configura­
       tion, the emulator is capable of a reduced set of commands
       to support audio. To use audio features, an ISDN card with
       a  audio-capable low-level driver is needed. Currently the
       only audio-capable drivers are the teles and HiSax driver.

       The  line  disciplines  are  handled by the kernel so that
       SLIP, CSLIP and asynchronous PPP are possible.

       The port speed of the ISDN tty  devices  is  always  64000


       The  description  of AT commands here does not cover audio
       related commands. For a description of audio related  com­
       mands,  see  isdn_audio(4).  The following AT commands are
       supported by ISDN tty devices:

       ATA    Answer an incoming call.

       ATDnum Dial number num.  Allowed are digits [0-9] and  the
              characters  ",", "#", ".", "*", "W", "P", "T", "S",
              "-". The characters are ignored except of "S" which
              indicates  a  SPV  if  it precedes the number (only
              German 1TR6 ISDN).

       ATE0   Echo off.

       ATE1   Echo on (default).

       ATH    Hang up.

       ATH0   Hang up.

       ATH1   Off hook (ignored).

       ATI    Return device Information ("ISDN for Linux...").

       ATI0   Return device Information ("ISDN for Linux...").
       ATSx?  Show content of register x.

              Set register x, bit y to value z

              Show bit y of register x.

       ATV0   Print result code as number.

       ATV1   Print result code as text (default).

       ATZ    Reset all registers and load profile values.

       AT&Bx  Set  packet  size  of  outgoing  packets to value x
              (maximum 4000). The actual packet size  depends  on
              the hardware driver and may be smaller than x (e.g.
              with the teles driver). There will be no error mes­
              sage  if  the  value  is  bigger  than the hardware
              driver can process. However the size of the  outgo­
              ing packets will be set correctly.

       AT&D2  DTR  falling  edge:  hang  up and return to command
              mode (default).

       AT&D3  DTR falling edge: hang up, return to  command  mode
              and reset all registers.

       AT&Ex  Set  MSN (Euro-ISDN, EDSS1) or EAZ (German 1TR6) to
              value x.  For MSNs, x is a string of digits  repre­
              senting  the  local  phone number, while for EAZs x
              should be only the last digit of the Number.

       AT&F   Set  all  registers  and   profile   to   "factory-

              Set list of phone numbers to listen on.  plist is a
              list of wildcard patterns separated  by  semicolon.
              If  this is set, it has precedence over the MSN set
              by AT&E.

       AT&V   Show current register settings.

       AT&W0  Write registers and EAZ/MSN to profile.  (You  need
              to run iprofd(8) for making changes permanent.)

       AT&X0  Disable BTX-Mode (default).

       AT&X1  Enable BTX-Mode.


              incoming call.

       2 (default 43 = '+')
              ASCII code of the escape character.

       3 (default 13 = CR)
              ASCII code of Carriage Return.

       4 (default 10 = LF)
              ASCII code of Line Feed.

       5 (default 8 = BS)
              ASCII code of Backspace.

       6 (default 3)
              Duration, in number of seconds, modem waits  before

       7 (default 60)
              Wait time for carrier in seconds.

       8 (default 2)
              Pause  time for comma (',') in dial command in sec­
              onds (ignored).

       9 (default 6)
              Carrier detect time in tenths of seconds (ignored).

       10 (default 7)
              Wait time until hangup after carrier loss in tenths
              of seconds (ignored).

       11 (default 70)
              Duration and delay in milliseconds for  touch  tone
              dialling (ignored).

       12 (default 69)
              Bit-mapped register.
              Bit  Description
              0    0 = Suppress response messages.
                   1 = Show response messages.
              1    0 = Response messages as text.
                   1 = Numeric response messages.
              2    0 = Echo off.
                   1 = Echo on.
              3    0 = DCD always on.
                   1 = DCD follows carrier.
              4    0 = CTS follows RTS.
                   1 = Ignore RTS, CTS always on.
              5    0 = Low-edge on DTR: Hangup and return
                        to command mode.
                   1 = Same as 0 but also resets all
                   1 = Hangup on DTR low.
              3    0 = Standard response messages.
                   1 = Extended response messages.
              4    0 = CALLER NUMBER before every RING.
                   1 = CALLER NUMBER after first RING.
              5    0 = Disable extended T.70 protocol.
                   1 = Enable extended T.70 protocol.
              6    0 = Disable RUNG message.
                   1 = RUNG on cancelled incoming call.
              7    0 = Disable display messages from net.
                   1 = Enable disable messages from net.

       14 (default 0)
              Layer-2 protocol.
               0 = X75/LAPB with I-frames.
               1 = X75/LAPB with UI-frames.
               2 = X75/LAPB with BUI-frames.
               3 = HDLC.
               4 = TRANSPARENT.
              10 = Analog Modem. (only if hardware supports this)
              11 = Fax G3. (only if hardware supports this)

       15 (default 0)
              Layer-3 protocol.
              0 = transparent
              1 = transparent with audio features (e.g. DSP)
              2 = Fax G3

       16 (default 250)
              Outgoing packet size / 16.

       17     reserved.

       18 (default 4)
              Service-Octet-1 to accept or to  be  used  on  dial
              Bit-mapped register.
              Bit  Description
              0    Service 1 (audio) when set.
              1    Service 5 (BTX) when set.
              2    Service 7 (data) when set.

              Note:  It  is possible to set more than one bit. In
                     this case, on outgoing calls, the most  sig­
                     nificant  1-bit is chosen to select the out­
                     going service octet. On incoming  calls  the
                     selected  services are accepted, contents of
                     register 14 is ignored and the  Layer-2-pro­
                     tocol  is automatically set with the follow­
                     ing values  to  match  the  service  of  the
                     incoming call:

       20 (read only)
              Service-Octet-1 of last incoming  call.  This  bit-
              mapped  register  is  set  on incoming call (during
              RING). Mapping is the same like register 18.

       21 (read only)
              Bit-mapped register. Set on incoming  call  (during
              RING) to the value of octet 3 of calling party num­
              ber Information Element (Numbering plan).  See sec­
              tion 4.5.10 of ITU Q.931.

       22 (read only)
              Bit-mapped  register.  Set on incoming call (during
              RING) to the value of octet  3a  of  calling  party
              number  Information  Element (Screening info).  See
              section 4.5.10 of ITU Q.931.

       23 (default 0)
              Bit-mapped register.
              Bit  Description
              0    0 = Disable CPN extended RING.
                   1 = Enable CPN extended RING.
              1    0 = Disable CPN extended FCON.
                   1 = Enable CPN extended FCON.

       NOTE   There used also be cui devices (major device number
              44),  but  since  the  cua  devices for regular tty
              devices are no  longer  supported  in  the  kernel,
              these  are also no longer supported for ISDN4linux.


       Fritz Elfert <fritz@isdn4linux.de>
       modified by Paul Slootman <paul@isdn4linux.de>


       icnctrl(8), telesctrl(8), isdninfo(4), isdn_audio(4), isd­

ISDN 4 Linux 3.3            2002/01/31                    ttyi(4)
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