linux/Documentation/isdn/README
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   1README for the ISDN-subsystem
   2
   31. Preface
   4
   5  1.1 Introduction
   6
   7  This README describes how to set up and how to use the different parts
   8  of the ISDN-subsystem.
   9
  10  For using the ISDN-subsystem, some additional userlevel programs are
  11  necessary. Those programs and some contributed utilities are available
  12  at
  13
  14   ftp.isdn4linux.de
  15
  16   /pub/isdn4linux/isdn4k-utils-<VersionNumber>.tar.gz
  17
  18
  19  We also have set up a mailing-list:
  20
  21   The isdn4linux-project originates in Germany, and therefore by historical
  22   reasons, the mailing-list's primary language is german. However mails
  23   written in english have been welcome all the time.
  24
  25   to subscribe: write a email to majordomo@listserv.isdn4linux.de,
  26   Subject irrelevant, in the message body:
  27   subscribe isdn4linux <your_email_address>
  28
  29   To write to the mailing-list, write to isdn4linux@listserv.isdn4linux.de
  30
  31   This mailinglist is bidirectionally gated to the newsgroup
  32
  33     de.alt.comm.isdn4linux
  34
  35  There is also a well maintained FAQ in English available at
  36     http://www.mhessler.de/i4lfaq/
  37  It can be viewed online, or downloaded in sgml/text/html format.
  38  The FAQ can also be viewed online at
  39     http://www.isdn4linux.de/faq/
  40  or downloaded from
  41     ftp://ftp.isdn4linux.de/pub/isdn4linux/FAQ/
  42
  43  1.1 Technical details
  44
  45  In the following Text, the terms MSN and EAZ are used.
  46
  47  MSN is the abbreviation for (M)ultiple(S)ubscriber(N)umber, and applies
  48  to Euro(EDSS1)-type lines. Usually it is simply the phone number.
  49
  50  EAZ is the abbreviation of (E)ndgeraete(A)uswahl(Z)iffer and
  51  applies to German 1TR6-type lines. This is a one-digit string,
  52  simply appended to the base phone number
  53
  54  The internal handling is nearly identical, so replace the appropriate
  55  term to that one, which applies to your local ISDN-environment.
  56
  57  When the link-level-module isdn.o is loaded, it supports up to 16
  58  low-level-modules with up to 64 channels. (The number 64 is arbitrarily
  59  chosen and can be configured at compile-time --ISDN_MAX in isdn.h).
  60  A low-level-driver can register itself through an interface (which is
  61  defined in isdnif.h) and gets assigned a slot.
  62  The following char-devices are made available for each channel:
  63
  64  A raw-control-device with the following functions:
  65     write: raw D-channel-messages (format: depends on driver).
  66     read:  raw D-channel-messages (format: depends on driver).
  67     ioctl: depends on driver, i.e. for the ICN-driver, the base-address of
  68            the ports and the shared memory on the card can be set and read
  69            also the boot-code and the protocol software can be loaded into
  70            the card.
  71
  72   O N L Y !!!  for debugging (no locking against other devices):
  73   One raw-data-device with the following functions:
  74     write: data to B-channel.
  75     read:  data from B-channel.
  76
  77   In addition the following devices are made available:
  78
  79   128 tty-devices (64 cuix and 64 ttyIx) with integrated modem-emulator:
  80   The functionality is almost the same as that of a serial device
  81   (the line-discs are handled by the kernel), which lets you run
  82   SLIP, CSLIP and asynchronous PPP through the devices. We have tested
  83   Seyon, minicom, CSLIP (uri-dip) PPP, mgetty, XCept and Hylafax. 
  84
  85   The modem-emulation supports the following:
  86           1.3.1 Commands:
  87
  88               ATA      Answer incoming call.
  89               ATD<No.> Dial, the number may contain:
  90                        [0-9] and [,#.*WPT-S]
  91                        the latter are ignored until 'S'.
  92                        The 'S' must precede the number, if
  93                        the line is a SPV (German 1TR6).
  94               ATE0     Echo off.
  95               ATE1     Echo on (default).
  96               ATH      Hang-up.
  97               ATH1     Off hook (ignored).
  98               ATH0     Hang-up.
  99               ATI      Return "ISDN for Linux...".
 100               ATI0        "
 101               ATI1        "
 102               ATI2     Report of last connection.
 103               ATO      On line (data mode).
 104               ATQ0     Enable result codes (default).
 105               ATQ1     Disable result codes (default).
 106               ATSx=y   Set register x to y.
 107               ATSx?    Show contents of register x.
 108               ATV0     Numeric responses.
 109               ATV1     English responses (default).
 110               ATZ      Load registers and EAZ/MSN from Profile.
 111               AT&Bx    Set Send-Packet-size to x (max. 4000)
 112                        The real packet-size may be limited by the
 113                        low-level-driver used. e.g. the HiSax-Module-
 114                        limit is 2000. You will get NO Error-Message,
 115                        if you set it to higher values, because at the
 116                        time of giving this command the corresponding
 117                        driver may not be selected (see "Automatic
 118                        Assignment") however the size of outgoing packets
 119                        will be limited correctly.
 120               AT&D0    Ignore DTR
 121               AT&D2    DTR-low-edge: Hang up and return to
 122                        command mode (default).
 123               AT&D3    Same as AT&D2 but also resets all registers.
 124               AT&Ex    Set the EAZ/MSN for this channel to x.
 125               AT&F     Reset all registers and profile to "factory-defaults"
 126               AT&Lx    Set list of phone numbers to listen on.  x is a
 127                        list of wildcard patterns separated by semicolon.
 128                        If this is set, it has precedence over the MSN set
 129                        by AT&E.
 130               AT&Rx    Select V.110 bitrate adaption.
 131                        This command enables V.110 protocol with 9600 baud
 132                        (x=9600), 19200 baud (x=19200) or 38400 baud
 133                        (x=38400). A value of x=0 disables V.110 switching
 134                        back to default X.75. This command sets the following
 135                        Registers:
 136                          Reg 14 (Layer-2 protocol):
 137                            x = 0:     0
 138                            x = 9600:  7
 139                            x = 19200: 8
 140                            x = 38400: 9
 141                          Reg 18.2 = 1
 142                          Reg 19 (Additional Service Indicator):
 143                            x = 0:       0
 144                            x = 9600:  197
 145                            x = 19200: 199
 146                            x = 38400: 198
 147                          Note on value in Reg 19:
 148                            There is _NO_ common convention for 38400 baud.
 149                            The value 198 is chosen arbitrarily. Users
 150                            _MUST_ negotiate this value before establishing
 151                            a connection.
 152               AT&Sx    Set window-size (x = 1..8) (not yet implemented)
 153               AT&V     Show all settings.
 154               AT&W0    Write registers and EAZ/MSN to profile. See also
 155                        iprofd (5.c in this README).
 156               AT&X0    BTX-mode and T.70-mode off (default)
 157               AT&X1    BTX-mode on. (S13.1=1, S13.5=0 S14=0, S16=7, S18=7, S19=0)
 158               AT&X2    T.70-mode on. (S13.1=1, S13.5=1, S14=0, S16=7, S18=7, S19=0)
 159               AT+Rx    Resume a suspended call with CallID x (x = 1,2,3...)
 160               AT+Sx    Suspend a call with CallID x (x = 1,2,3...)
 161
 162           For voice-mode commands refer to README.audio
 163
 164           1.3.2 Escape sequence:
 165               During a connection, the emulation reacts just like
 166               a normal modem to the escape sequence <DELAY>+++<DELAY>.
 167               (The escape character - default '+' - can be set in the
 168               register 2).
 169               The DELAY must at least be 1.5 seconds long and delay
 170               between the escape characters must not exceed 0.5 seconds.
 171
 172           1.3.3 Registers:
 173
 174              Nr.  Default  Description
 175              0    0        Answer on ring number.
 176                            (no auto-answer if S0=0).
 177              1    0        Count of rings.
 178              2    43       Escape character.
 179                            (a value >= 128 disables the escape sequence).
 180              3    13       Carriage return character (ASCII).
 181              4    10       Line feed character (ASCII).
 182              5    8        Backspace character (ASCII).
 183              6    3        Delay in seconds before dialing.
 184              7    60       Wait for carrier.
 185              8    2        Pause time for comma (ignored)
 186              9    6        Carrier detect time (ignored)
 187             10    7        Carrier loss to disconnect time (ignored).
 188             11    70       Touch tone timing (ignored).
 189             12    69       Bit coded register:
 190                            Bit 0:    0 = Suppress response messages.
 191                                      1 = Show response messages.
 192                            Bit 1:    0 = English response messages.
 193                                      1 = Numeric response messages.
 194                            Bit 2:    0 = Echo off.
 195                                      1 = Echo on.
 196                            Bit 3     0 = DCD always on.
 197                                      1 = DCD follows carrier.
 198                            Bit 4     0 = CTS follows RTS
 199                                      1 = Ignore RTS, CTS always on.
 200                            Bit 5     0 = return to command mode on DTR low.
 201                                      1 = Same as 0 but also resets all
 202                                          registers.
 203                                      See also register 13, bit 2
 204                            Bit 6     0 = DSR always on.
 205                                      1 = DSR only on if channel is available.
 206                            Bit 7     0 = Cisco-PPP-flag-hack off (default).
 207                                      1 = Cisco-PPP-flag-hack on.
 208             13   0         Bit coded register:
 209                            Bit 0:    0 = Use delayed tty-send-algorithm
 210                                      1 = Direct tty-send.
 211                            Bit 1:    0 = T.70 protocol (Only for BTX!) off
 212                                      1 = T.70 protocol (Only for BTX!) on
 213                            Bit 2:    0 = Don't hangup on DTR low.
 214                                      1 = Hangup on DTR low.
 215                            Bit 3:    0 = Standard response messages
 216                                      1 = Extended response messages
 217                            Bit 4:    0 = CALLER NUMBER before every RING.
 218                                      1 = CALLER NUMBER after first RING.
 219                            Bit 5:    0 = T.70 extended protocol off
 220                                      1 = T.70 extended protocol on
 221                            Bit 6:    0 = Special RUNG Message off
 222                                      1 = Special RUNG Message on
 223                                          "RUNG" is delivered on a ttyI, if
 224                                          an incoming call happened (RING) and
 225                                          the remote party hung up before any
 226                                          local ATA was given.
 227                            Bit 7:    0 = Don't show display messages from net
 228                                      1 = Show display messages from net
 229                                          (S12 Bit 1 must be 0 too)      
 230             14   0         Layer-2 protocol:
 231                                      0 = X75/LAPB with I-frames
 232                                      1 = X75/LAPB with UI-frames
 233                                      2 = X75/LAPB with BUI-frames
 234                                      3 = HDLC
 235                                      4 = Transparent (audio)
 236                                      7 = V.110, 9600 baud
 237                                      8 = V.110, 19200 baud
 238                                      9 = V.110, 38400 baud
 239                                     10 = Analog Modem (only if hardware supports this)
 240                                     11 = Fax G3 (only if hardware supports this)
 241             15   0         Layer-3 protocol:
 242                                      0 = transparent
 243                                      1 = transparent with audio features (e.g. DSP)
 244                                      2 = Fax G3 Class 2 commands (S14 has to be set to 11)
 245                                      3 = Fax G3 Class 1 commands (S14 has to be set to 11)
 246             16   250       Send-Packet-size/16
 247             17   8         Window-size (not yet implemented)
 248             18   4         Bit coded register, Service-Octet-1 to accept,
 249                            or to be used on dialout:
 250                            Bit 0:    Service 1 (audio) when set.
 251                            Bit 1:    Service 5 (BTX) when set.
 252                            Bit 2:    Service 7 (data) when set.
 253                            Note: It is possible to set more than one
 254                                  bit. In this case, on incoming calls
 255                                  the selected services are accepted,
 256                                  and if the service is "audio", the
 257                                  Layer-2-protocol is automatically
 258                                  changed to 4 regardless of the setting
 259                                  of register 14. On outgoing calls,
 260                                  the most significant 1-bit is chosen to
 261                                  select the outgoing service octet.
 262             19   0         Service-Octet-2
 263             20   0         Bit coded register (readonly)
 264                            Service-Octet-1 of last call.
 265                            Bit mapping is the same as register 18
 266             21   0         Bit coded register (readonly)
 267                            Set on incoming call (during RING) to
 268                            octet 3 of calling party number IE (Numbering plan)
 269                            See section 4.5.10 of ITU Q.931
 270             22   0         Bit coded register (readonly)
 271                            Set on incoming call (during RING) to
 272                            octet 3a of calling party number IE (Screening info)
 273                            See section 4.5.10 of ITU Q.931
 274             23   0         Bit coded register:
 275                            Bit 0:    0 = Add CPN to RING message off
 276                                      1 = Add CPN to RING message on
 277                            Bit 1:    0 = Add CPN to FCON message off
 278                                      1 = Add CPN to FCON message on
 279                            Bit 2:    0 = Add CDN to RING/FCON message off
 280                                      1 = Add CDN to RING/FCON message on
 281
 282  Last but not least a (at the moment fairly primitive) device to request
 283  the line-status (/dev/isdninfo) is made available.
 284
 285  Automatic assignment of devices to lines:
 286
 287  All inactive physical lines are listening to all EAZs for incoming
 288  calls and are NOT assigned to a specific tty or network interface.
 289  When an incoming call is detected, the driver looks first for a network
 290  interface and then for an opened tty which:
 291
 292  1. is configured for the same EAZ.
 293  2. has the same protocol settings for the B-channel.
 294  3. (only for network interfaces if the security flag is set)
 295     contains the caller number in its access list.
 296  4. Either the channel is not bound exclusively to another Net-interface, or
 297     it is bound AND the other checks apply to exactly this interface.
 298     (For usage of the bind-features, refer to the isdnctrl-man-page)
 299
 300  Only when a matching interface or tty is found is the call accepted
 301  and the "connection" between the low-level-layer and the link-level-layer
 302  is established and kept until the end of the connection.
 303  In all other cases no connection is established. Isdn4linux can be
 304  configured to either do NOTHING in this case (which is useful, if
 305  other, external devices with the same EAZ/MSN are connected to the bus)
 306  or to reject the call actively. (isdnctrl busreject ...)
 307
 308  For an outgoing call, the inactive physical lines are searched.
 309  The call is placed on the first physical line, which supports the
 310  requested protocols for the B-channel. If a net-interface, however
 311  is pre-bound to a channel, this channel is used directly.
 312
 313  This makes it possible to configure several network interfaces and ttys
 314  for one EAZ, if the network interfaces are set to secure operation.
 315  If an incoming call matches one network interface, it gets connected to it.
 316  If another incoming call for the same EAZ arrives, which does not match
 317  a network interface, the first tty gets a "RING" and so on.
 318
 3192 System prerequisites:
 320
 321  ATTENTION!
 322
 323  Always use the latest module utilities. The current version is
 324  named in Documentation/Changes. Some old versions of insmod
 325  are not capable of setting the driver-Ids correctly.
 326
 3273. Lowlevel-driver configuration.
 328
 329   Configuration depends on how the drivers are built. See the
 330   README.<yourDriver> for information on driver-specific setup.
 331
 3324. Device-inodes
 333
 334   The major and minor numbers and their names are described in
 335   Documentation/devices.txt. The major numbers are:
 336
 337     43 for the ISDN-tty's.
 338     44 for the ISDN-callout-tty's.
 339     45 for control/info/debug devices.
 340
 3415. Application
 342
 343   a) For some card-types, firmware has to be loaded into the cards, before
 344      proceeding with device-independent setup. See README.<yourDriver>
 345      for how to do that.
 346
 347   b) If you only intend to use ttys, you are nearly ready now.
 348
 349   c) If you want to have really permanent "Modem"-settings on disk, you
 350      can start the daemon iprofd. Give it a path to a file at the command-
 351      line. It will store the profile-settings in this file every time
 352      an AT&W0 is performed on any ISDN-tty. If the file already exists,
 353      all profiles are initialized from this file. If you want to unload
 354      any of the modules, kill iprofd first.
 355
 356   d) For networking, continue: Create an interface:
 357       isdnctrl addif isdn0
 358
 359   e) Set the EAZ (or MSN for Euro-ISDN):
 360       isdnctrl eaz isdn0 2
 361
 362     (For 1TR6 a single digit is allowed, for Euro-ISDN the number is your
 363      real MSN e.g.: Phone-Number)
 364
 365   f) Set the number for outgoing calls on the interface:
 366       isdnctrl addphone isdn0 out 1234567
 367       ... (this can be executed more than once, all assigned numbers are
 368            tried in order)
 369      and the number(s) for incoming calls:
 370       isdnctrl addphone isdn0 in 1234567
 371
 372   g) Set the timeout for hang-up:
 373       isdnctrl huptimeout isdn0 <timeout_in_seconds>
 374
 375   h) additionally you may activate charge-hang-up (= Hang up before
 376      next charge-info, this only works, if your isdn-provider transmits
 377      the charge-info during and after the connection):
 378       isdnctrl chargehup isdn0 on
 379
 380   i) Set the dial mode of the interface:
 381       isdnctrl dialmode isdn0 auto
 382      "off" means that you (or the system) cannot make any connection
 383        (neither incoming or outgoing connections are possible). Use
 384        this if you want to be sure that no connections will be made.
 385      "auto" means that the interface is in auto-dial mode, and will
 386        attempt to make a connection whenever a network data packet needs
 387        the interface's link. Note that this can cause unexpected dialouts,
 388        and lead to a high phone bill! Some daemons or other pc's that use
 389        this interface can cause this.
 390        Incoming connections are also possible.
 391      "manual" is a dial mode created to prevent the unexpected dialouts.
 392        In this mode, the interface will never make any connections on its
 393        own. You must explicitly initiate a connection with "isdnctrl dial
 394        isdn0". However, after an idle time of no traffic as configured for
 395        the huptimeout value with isdnctrl, the connection _will_ be ended.
 396        If you don't want any automatic hangup, set the huptimeout value to 0.
 397        "manual" is the default.
 398
 399   j) Setup the interface with ifconfig as usual, and set a route to it.
 400
 401   k) (optional) If you run X11 and have Tcl/Tk-wish version 4.0, you can use
 402     the script tools/tcltk/isdnmon. You can add actions for line-status
 403     changes. See the comments at the beginning of the script for how to
 404     do that. There are other tty-based tools in the tools-subdirectory
 405     contributed by Michael Knigge (imon), Volker Götz (imontty) and
 406     Andreas Kool (isdnmon).
 407
 408   l) For initial testing, you can set the verbose-level to 2 (default: 0).
 409      Then all incoming calls are logged, even if they are not addressed
 410      to one of the configured net-interfaces:
 411      isdnctrl verbose 2
 412
 413  Now you are ready! A ping to the set address should now result in an
 414  automatic dial-out (look at syslog kernel-messages).
 415  The phone numbers and EAZs can be assigned at any time with isdnctrl.
 416  You can add as many interfaces as you like with addif following the
 417  directions above. Of course, there may be some limitations. But we have
 418  tested as many as 20 interfaces without any problem. However, if you
 419  don't give an interface name to addif, the  kernel will assign a name
 420  which starts with "eth". The number of "eth"-interfaces is limited by
 421  the kernel.
 422
 4235. Additional options for isdnctrl:
 424
 425   "isdnctrl secure <InterfaceName> on"
 426   Only incoming calls, for which the caller-id is listed in the access
 427   list of the interface are accepted. You can add caller-id's With the
 428   command "isdnctrl addphone <InterfaceName> in <caller-id>"
 429   Euro-ISDN does not transmit the leading '0' of the caller-id for an
 430   incoming call, therefore you should configure it accordingly.
 431   If the real number for the dialout e.g. is "09311234567" the number
 432   to configure here is "9311234567". The pattern-match function
 433   works similar to the shell mechanism.
 434
 435     ?     one arbitrary digit
 436     *     zero or arbitrary many digits
 437     [123] one of the digits in the list
 438     [1-5] one digit between '1' and '5'
 439           a '^' as the first character in a list inverts the list
 440
 441
 442   "isdnctrl secure <InterfaceName> off"
 443   Switch off secure operation (default).
 444
 445   "isdnctrl ihup <InterfaceName> [on|off]"
 446   Switch the hang-up-timer for incoming calls on or off.
 447
 448   "isdnctrl eaz <InterfaceName>"
 449   Returns the EAZ of an interface.
 450
 451   "isdnctrl delphone <InterfaceName> in|out <number>"
 452   Deletes a number from one of the access-lists of the interface.
 453
 454   "isdnctrl delif <InterfaceName>"
 455   Removes the interface (and possible slaves) from the kernel.
 456   (You have to unregister it with "ifconfig <InterfaceName> down" before).
 457
 458   "isdnctrl callback <InterfaceName> [on|off]"
 459   Switches an interface to callback-mode. In this mode, an incoming call
 460   will be rejected and after this the remote-station will be called. If
 461   you test this feature by using ping, some routers will re-dial very
 462   quickly, so that the callback from isdn4linux may not be recognized.
 463   In this case use ping with the option -i <sec> to increase the interval
 464   between echo-packets.
 465
 466   "isdnctrl cbdelay <InterfaceName> [seconds]"
 467   Sets the delay (default 5 sec) between an incoming call and start of
 468   dialing when callback is enabled.
 469
 470   "isdnctrl cbhup <InterfaceName> [on|off]"
 471   This enables (default) or disables an active hangup (reject) when getting an
 472   incoming call for an interface which is configured for callback.
 473
 474   "isdnctrl encap <InterfaceName> <EncapType>"
 475   Selects the type of packet-encapsulation. The encapsulation can be changed
 476   only while an interface is down.
 477
 478   At the moment the following values are supported:
 479
 480   rawip    (Default) Selects raw-IP-encapsulation. This means, MAC-headers
 481            are stripped off.
 482   ip       IP with type-field. Same as IP but the type-field of the MAC-header
 483            is preserved.
 484   x25iface X.25 interface encapsulation (first byte semantics as defined in
 485            ../networking/x25-iface.txt). Use this for running the linux
 486            X.25 network protocol stack (AF_X25 sockets) on top of isdn.
 487   cisco-h  A special-mode for communicating with a Cisco, which is configured
 488            to do "hdlc"
 489   ethernet No stripping. Packets are sent with full MAC-header.
 490            The Ethernet-address of the interface is faked, from its
 491            IP-address: fc:fc:i1:i2:i3:i4, where i1-4 are the IP-addr.-values.
 492   syncppp  Synchronous PPP
 493
 494   uihdlc   HDLC with UI-frame-header (for use with DOS ISPA, option -h1)
 495
 496
 497   NOTE:    x25iface encapsulation is currently experimental. Please
 498            read README.x25 for further details
 499
 500
 501   Watching packets, using standard-tcpdump will fail for all encapsulations
 502   except ethernet because tcpdump does not know how to handle packets
 503   without MAC-header. A patch for tcpdump is included in the utility-package
 504   mentioned above.
 505
 506   "isdnctrl l2_prot <InterfaceName> <L2-ProtocolName>"
 507   Selects a layer-2-protocol.
 508   (With the ICN-driver and the HiSax-driver, "x75i" and "hdlc" is available.
 509   With other drivers, "x75ui", "x75bui", "x25dte", "x25dce" may be
 510   possible too. See README.x25 for x25 related l2 protocols.)
 511
 512   isdnctrl l3_prot <InterfaceName> <L3-ProtocolName>
 513   The same for layer-3. (At the moment only "trans" is allowed)
 514
 515   "isdnctrl list <InterfaceName>"
 516   Shows all parameters of an interface and the charge-info.
 517   Try "all" as the interface name.
 518
 519   "isdnctrl hangup <InterfaceName>"
 520   Forces hangup of an interface.
 521
 522   "isdnctrl bind <InterfaceName> <DriverId>,<ChannelNumber> [exclusive]"
 523   If you are using more than one ISDN card, it is sometimes necessary to
 524   dial out using a specific card or even preserve a specific channel for
 525   dialout of a specific net-interface. This can be done with the above
 526   command. Replace <DriverId> by whatever you assigned while loading the
 527   module. The <ChannelNumber> is counted from zero. The upper limit
 528   depends on the card used. At the moment no card supports more than
 529   2 channels, so the upper limit is one.
 530
 531   "isdnctrl unbind <InterfaceName>"
 532   unbinds a previously bound interface.
 533
 534   "isdnctrl busreject <DriverId> on|off"
 535   If switched on, isdn4linux replies a REJECT to incoming calls, it
 536   cannot match to any configured interface.
 537   If switched off, nothing happens in this case.
 538   You normally should NOT enable this feature, if the ISDN adapter is not
 539   the only device connected to the S0-bus. Otherwise it could happen that
 540   isdn4linux rejects an incoming call, which belongs to another device on
 541   the bus.
 542
 543   "isdnctrl addslave <InterfaceName> <SlaveName>
 544   Creates a slave interface for channel-bundling. Slave interfaces are
 545   not seen by the kernel, but their ISDN-part can be configured with
 546   isdnctrl as usual. (Phone numbers, EAZ/MSN, timeouts etc.) If more
 547   than two channels are to be bundled, feel free to create as many as you
 548   want. InterfaceName must be a real interface, NOT a slave. Slave interfaces
 549   start dialing, if the master interface resp. the previous slave interface
 550   has a load of more than 7000 cps. They hangup if the load goes under 7000
 551   cps, according to their "huptimeout"-parameter.
 552
 553   "isdnctrl sdelay <InterfaceName> secs."
 554   This sets the minimum time an Interface has to be fully loaded, until
 555   it sends a dial-request to its slave.
 556
 557   "isdnctrl dial <InterfaceName>"
 558   Forces an interface to start dialing even if no packets are to be
 559   transferred.
 560
 561   "isdnctrl mapping <DriverId> MSN0,MSN1,MSN2,...MSN9"
 562   This installs a mapping table for EAZ<->MSN-mapping for a single line.
 563   Missing MSN's have to be given as "-" or can be omitted, if at the end
 564   of the commandline.
 565   With this command, it's now possible to have an interface listening to
 566   mixed 1TR6- and Euro-Type lines. In this case, the interface has to be
 567   configured to a 1TR6-type EAZ (one digit). The mapping is also valid
 568   for tty-emulation. Seen from the interface/tty-level the mapping
 569   CAN be used, however it's possible to use single tty's/interfaces with
 570   real MSN's (more digits) also, in which case the mapping will be ignored.
 571   Here is an example:
 572
 573   You have a 1TR6-type line with base-nr. 1234567 and a Euro-line with
 574   MSN's 987654, 987655 and 987656. The DriverId for the Euro-line is "EURO".
 575
 576   isdnctrl mapping EURO -,987654,987655,987656,-,987655
 577   ...
 578   isdnctrl eaz isdn0 1      # listen on 12345671(1tr6) and 987654(euro)
 579   ...
 580   isdnctrl eaz isdn1 4      # listen on 12345674(1tr6) only.
 581   ...
 582   isdnctrl eaz isdn2 987654 # listen on 987654(euro) only.
 583
 584   Same scheme is used with AT&E...  at the tty's.
 585
 5866. If you want to write a new low-level-driver, you are welcome.
 587   The interface to the link-level-module is described in the file INTERFACE.
 588   If the interface should be expanded for any reason, don't do it
 589   on your own, send me a mail containing the proposed changes and
 590   some reasoning about them.
 591   If other drivers will not be affected, I will include the changes
 592   in the next release.
 593   For developers only, there is a second mailing-list. Write to me
 594   (fritz@isdn4linux.de), if you want to join that list.
 595
 596Have fun!
 597
 598 -Fritz
 599
 600
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