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-README for the ISDN-subsystem
-
-1. Preface
-
- 1.1 Introduction
-
- This README describes how to set up and how to use the different parts
- of the ISDN-subsystem.
-
- For using the ISDN-subsystem, some additional userlevel programs are
- necessary. Those programs and some contributed utilities are available
- at
-
- ftp.isdn4linux.de
-
- /pub/isdn4linux/isdn4k-utils-<VersionNumber>.tar.gz
-
-
- We also have set up a mailing-list:
-
- The isdn4linux-project originates in Germany, and therefore by historical
- reasons, the mailing-list's primary language is german. However mails
- written in english have been welcome all the time.
-
- to subscribe: write a email to majordomo@listserv.isdn4linux.de,
- Subject irrelevant, in the message body:
- subscribe isdn4linux <your_email_address>
-
- To write to the mailing-list, write to isdn4linux@listserv.isdn4linux.de
-
- This mailinglist is bidirectionally gated to the newsgroup
-
- de.alt.comm.isdn4linux
-
- There is also a well maintained FAQ in English available at
- https://www.mhessler.de/i4lfaq/
- It can be viewed online, or downloaded in sgml/text/html format.
- The FAQ can also be viewed online at
- https://www.isdn4linux.de/faq/i4lfaq.html
- or downloaded from
- ftp://ftp.isdn4linux.de/pub/isdn4linux/FAQ/
-
- 1.1 Technical details
-
- In the following Text, the terms MSN and EAZ are used.
-
- MSN is the abbreviation for (M)ultiple(S)ubscriber(N)umber, and applies
- to Euro(EDSS1)-type lines. Usually it is simply the phone number.
-
- EAZ is the abbreviation of (E)ndgeraete(A)uswahl(Z)iffer and
- applies to German 1TR6-type lines. This is a one-digit string,
- simply appended to the base phone number
-
- The internal handling is nearly identical, so replace the appropriate
- term to that one, which applies to your local ISDN-environment.
-
- When the link-level-module isdn.o is loaded, it supports up to 16
- low-level-modules with up to 64 channels. (The number 64 is arbitrarily
- chosen and can be configured at compile-time --ISDN_MAX in isdn.h).
- A low-level-driver can register itself through an interface (which is
- defined in isdnif.h) and gets assigned a slot.
- The following char-devices are made available for each channel:
-
- A raw-control-device with the following functions:
- write: raw D-channel-messages (format: depends on driver).
- read: raw D-channel-messages (format: depends on driver).
- ioctl: depends on driver, i.e. for the ICN-driver, the base-address of
- the ports and the shared memory on the card can be set and read
- also the boot-code and the protocol software can be loaded into
- the card.
-
- O N L Y !!! for debugging (no locking against other devices):
- One raw-data-device with the following functions:
- write: data to B-channel.
- read: data from B-channel.
-
- In addition the following devices are made available:
-
- 128 tty-devices (64 cuix and 64 ttyIx) with integrated modem-emulator:
- The functionality is almost the same as that of a serial device
- (the line-discs are handled by the kernel), which lets you run
- SLIP, CSLIP and asynchronous PPP through the devices. We have tested
- Seyon, minicom, CSLIP (uri-dip) PPP, mgetty, XCept and Hylafax.
-
- The modem-emulation supports the following:
- 1.3.1 Commands:
-
- ATA Answer incoming call.
- ATD<No.> Dial, the number may contain:
- [0-9] and [,#.*WPT-S]
- the latter are ignored until 'S'.
- The 'S' must precede the number, if
- the line is a SPV (German 1TR6).
- ATE0 Echo off.
- ATE1 Echo on (default).
- ATH Hang-up.
- ATH1 Off hook (ignored).
- ATH0 Hang-up.
- ATI Return "ISDN for Linux...".
- ATI0 "
- ATI1 "
- ATI2 Report of last connection.
- ATO On line (data mode).
- ATQ0 Enable result codes (default).
- ATQ1 Disable result codes (default).
- ATSx=y Set register x to y.
- ATSx? Show contents of register x.
- ATV0 Numeric responses.
- ATV1 English responses (default).
- ATZ Load registers and EAZ/MSN from Profile.
- AT&Bx Set Send-Packet-size to x (max. 4000)
- The real packet-size may be limited by the
- low-level-driver used. e.g. the HiSax-Module-
- limit is 2000. You will get NO Error-Message,
- if you set it to higher values, because at the
- time of giving this command the corresponding
- driver may not be selected (see "Automatic
- Assignment") however the size of outgoing packets
- will be limited correctly.
- AT&D0 Ignore DTR
- AT&D2 DTR-low-edge: Hang up and return to
- command mode (default).
- AT&D3 Same as AT&D2 but also resets all registers.
- AT&Ex Set the EAZ/MSN for this channel to x.
- AT&F Reset all registers and profile to "factory-defaults"
- AT&Lx Set list of phone numbers to listen on. x is a
- list of wildcard patterns separated by semicolon.
- If this is set, it has precedence over the MSN set
- by AT&E.
- AT&Rx Select V.110 bitrate adaption.
- This command enables V.110 protocol with 9600 baud
- (x=9600), 19200 baud (x=19200) or 38400 baud
- (x=38400). A value of x=0 disables V.110 switching
- back to default X.75. This command sets the following
- Registers:
- Reg 14 (Layer-2 protocol):
- x = 0: 0
- x = 9600: 7
- x = 19200: 8
- x = 38400: 9
- Reg 18.2 = 1
- Reg 19 (Additional Service Indicator):
- x = 0: 0
- x = 9600: 197
- x = 19200: 199
- x = 38400: 198
- Note on value in Reg 19:
- There is _NO_ common convention for 38400 baud.
- The value 198 is chosen arbitrarily. Users
- _MUST_ negotiate this value before establishing
- a connection.
- AT&Sx Set window-size (x = 1..8) (not yet implemented)
- AT&V Show all settings.
- AT&W0 Write registers and EAZ/MSN to profile. See also
- iprofd (5.c in this README).
- AT&X0 BTX-mode and T.70-mode off (default)
- AT&X1 BTX-mode on. (S13.1=1, S13.5=0 S14=0, S16=7, S18=7, S19=0)
- AT&X2 T.70-mode on. (S13.1=1, S13.5=1, S14=0, S16=7, S18=7, S19=0)
- AT+Rx Resume a suspended call with CallID x (x = 1,2,3...)
- AT+Sx Suspend a call with CallID x (x = 1,2,3...)
-
- For voice-mode commands refer to README.audio
-
- 1.3.2 Escape sequence:
- During a connection, the emulation reacts just like
- a normal modem to the escape sequence <DELAY>+++<DELAY>.
- (The escape character - default '+' - can be set in the
- register 2).
- The DELAY must at least be 1.5 seconds long and delay
- between the escape characters must not exceed 0.5 seconds.
-
- 1.3.3 Registers:
-
- Nr. Default Description
- 0 0 Answer on ring number.
- (no auto-answer if S0=0).
- 1 0 Count of rings.
- 2 43 Escape character.
- (a value >= 128 disables the escape sequence).
- 3 13 Carriage return character (ASCII).
- 4 10 Line feed character (ASCII).
- 5 8 Backspace character (ASCII).
- 6 3 Delay in seconds before dialing.
- 7 60 Wait for carrier.
- 8 2 Pause time for comma (ignored)
- 9 6 Carrier detect time (ignored)
- 10 7 Carrier loss to disconnect time (ignored).
- 11 70 Touch tone timing (ignored).
- 12 69 Bit coded register:
- Bit 0: 0 = Suppress response messages.
- 1 = Show response messages.
- Bit 1: 0 = English response messages.
- 1 = Numeric response messages.
- Bit 2: 0 = Echo off.
- 1 = Echo on.
- Bit 3 0 = DCD always on.
- 1 = DCD follows carrier.
- Bit 4 0 = CTS follows RTS
- 1 = Ignore RTS, CTS always on.
- Bit 5 0 = return to command mode on DTR low.
- 1 = Same as 0 but also resets all
- registers.
- See also register 13, bit 2
- Bit 6 0 = DSR always on.
- 1 = DSR only on if channel is available.
- Bit 7 0 = Cisco-PPP-flag-hack off (default).
- 1 = Cisco-PPP-flag-hack on.
- 13 0 Bit coded register:
- Bit 0: 0 = Use delayed tty-send-algorithm
- 1 = Direct tty-send.
- Bit 1: 0 = T.70 protocol (Only for BTX!) off
- 1 = T.70 protocol (Only for BTX!) on
- Bit 2: 0 = Don't hangup on DTR low.
- 1 = Hangup on DTR low.
- Bit 3: 0 = Standard response messages
- 1 = Extended response messages
- Bit 4: 0 = CALLER NUMBER before every RING.
- 1 = CALLER NUMBER after first RING.
- Bit 5: 0 = T.70 extended protocol off
- 1 = T.70 extended protocol on
- Bit 6: 0 = Special RUNG Message off
- 1 = Special RUNG Message on
- "RUNG" is delivered on a ttyI, if
- an incoming call happened (RING) and
- the remote party hung up before any
- local ATA was given.
- Bit 7: 0 = Don't show display messages from net
- 1 = Show display messages from net
- (S12 Bit 1 must be 0 too)
- 14 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 (audio)
- 7 = V.110, 9600 baud
- 8 = V.110, 19200 baud
- 9 = V.110, 38400 baud
- 10 = Analog Modem (only if hardware supports this)
- 11 = Fax G3 (only if hardware supports this)
- 15 0 Layer-3 protocol:
- 0 = transparent
- 1 = transparent with audio features (e.g. DSP)
- 2 = Fax G3 Class 2 commands (S14 has to be set to 11)
- 3 = Fax G3 Class 1 commands (S14 has to be set to 11)
- 16 250 Send-Packet-size/16
- 17 8 Window-size (not yet implemented)
- 18 4 Bit coded register, Service-Octet-1 to accept,
- or to be used on dialout:
- Bit 0: Service 1 (audio) when set.
- Bit 1: Service 5 (BTX) when set.
- Bit 2: Service 7 (data) when set.
- Note: It is possible to set more than one
- bit. In this case, on incoming calls
- the selected services are accepted,
- and if the service is "audio", the
- Layer-2-protocol is automatically
- changed to 4 regardless of the setting
- of register 14. On outgoing calls,
- the most significant 1-bit is chosen to
- select the outgoing service octet.
- 19 0 Service-Octet-2
- 20 0 Bit coded register (readonly)
- Service-Octet-1 of last call.
- Bit mapping is the same as register 18
- 21 0 Bit coded register (readonly)
- Set on incoming call (during RING) to
- octet 3 of calling party number IE (Numbering plan)
- See section 4.5.10 of ITU Q.931
- 22 0 Bit coded register (readonly)
- Set on incoming call (during RING) to
- octet 3a of calling party number IE (Screening info)
- See section 4.5.10 of ITU Q.931
- 23 0 Bit coded register:
- Bit 0: 0 = Add CPN to RING message off
- 1 = Add CPN to RING message on
- Bit 1: 0 = Add CPN to FCON message off
- 1 = Add CPN to FCON message on
- Bit 2: 0 = Add CDN to RING/FCON message off
- 1 = Add CDN to RING/FCON message on
-
- Last but not least a (at the moment fairly primitive) device to request
- the line-status (/dev/isdninfo) is made available.
-
- Automatic assignment of devices to lines:
-
- All inactive physical lines are listening to all EAZs for incoming
- calls and are NOT assigned to a specific tty or network interface.
- When an incoming call is detected, the driver looks first for a network
- interface and then for an opened tty which:
-
- 1. is configured for the same EAZ.
- 2. has the same protocol settings for the B-channel.
- 3. (only for network interfaces if the security flag is set)
- contains the caller number in its access list.
- 4. Either the channel is not bound exclusively to another Net-interface, or
- it is bound AND the other checks apply to exactly this interface.
- (For usage of the bind-features, refer to the isdnctrl-man-page)
-
- Only when a matching interface or tty is found is the call accepted
- and the "connection" between the low-level-layer and the link-level-layer
- is established and kept until the end of the connection.
- In all other cases no connection is established. Isdn4linux can be
- configured to either do NOTHING in this case (which is useful, if
- other, external devices with the same EAZ/MSN are connected to the bus)
- or to reject the call actively. (isdnctrl busreject ...)
-
- For an outgoing call, the inactive physical lines are searched.
- The call is placed on the first physical line, which supports the
- requested protocols for the B-channel. If a net-interface, however
- is pre-bound to a channel, this channel is used directly.
-
- This makes it possible to configure several network interfaces and ttys
- for one EAZ, if the network interfaces are set to secure operation.
- If an incoming call matches one network interface, it gets connected to it.
- If another incoming call for the same EAZ arrives, which does not match
- a network interface, the first tty gets a "RING" and so on.
-
-2 System prerequisites:
-
- ATTENTION!
-
- Always use the latest module utilities. The current version is
- named in Documentation/Changes. Some old versions of insmod
- are not capable of setting the driver-Ids correctly.
-
-3. Lowlevel-driver configuration.
-
- Configuration depends on how the drivers are built. See the
- README.<yourDriver> for information on driver-specific setup.
-
-4. Device-inodes
-
- The major and minor numbers and their names are described in
- Documentation/admin-guide/devices.rst. The major numbers are:
-
- 43 for the ISDN-tty's.
- 44 for the ISDN-callout-tty's.
- 45 for control/info/debug devices.
-
-5. Application
-
- a) For some card-types, firmware has to be loaded into the cards, before
- proceeding with device-independent setup. See README.<yourDriver>
- for how to do that.
-
- b) If you only intend to use ttys, you are nearly ready now.
-
- c) If you want to have really permanent "Modem"-settings on disk, you
- can start the daemon iprofd. Give it a path to a file at the command-
- line. It will store the profile-settings in this file every time
- an AT&W0 is performed on any ISDN-tty. If the file already exists,
- all profiles are initialized from this file. If you want to unload
- any of the modules, kill iprofd first.
-
- d) For networking, continue: Create an interface:
- isdnctrl addif isdn0
-
- e) Set the EAZ (or MSN for Euro-ISDN):
- isdnctrl eaz isdn0 2
-
- (For 1TR6 a single digit is allowed, for Euro-ISDN the number is your
- real MSN e.g.: Phone-Number)
-
- f) Set the number for outgoing calls on the interface:
- isdnctrl addphone isdn0 out 1234567
- ... (this can be executed more than once, all assigned numbers are
- tried in order)
- and the number(s) for incoming calls:
- isdnctrl addphone isdn0 in 1234567
-
- g) Set the timeout for hang-up:
- isdnctrl huptimeout isdn0 <timeout_in_seconds>
-
- h) additionally you may activate charge-hang-up (= Hang up before
- next charge-info, this only works, if your isdn-provider transmits
- the charge-info during and after the connection):
- isdnctrl chargehup isdn0 on
-
- i) Set the dial mode of the interface:
- isdnctrl dialmode isdn0 auto
- "off" means that you (or the system) cannot make any connection
- (neither incoming or outgoing connections are possible). Use
- this if you want to be sure that no connections will be made.
- "auto" means that the interface is in auto-dial mode, and will
- attempt to make a connection whenever a network data packet needs
- the interface's link. Note that this can cause unexpected dialouts,
- and lead to a high phone bill! Some daemons or other pc's that use
- this interface can cause this.
- Incoming connections are also possible.
- "manual" is a dial mode created to prevent the unexpected dialouts.
- In this mode, the interface will never make any connections on its
- own. You must explicitly initiate a connection with "isdnctrl dial
- isdn0". However, after an idle time of no traffic as configured for
- the huptimeout value with isdnctrl, the connection _will_ be ended.
- If you don't want any automatic hangup, set the huptimeout value to 0.
- "manual" is the default.
-
- j) Setup the interface with ifconfig as usual, and set a route to it.
-
- k) (optional) If you run X11 and have Tcl/Tk-wish version 4.0, you can use
- the script tools/tcltk/isdnmon. You can add actions for line-status
- changes. See the comments at the beginning of the script for how to
- do that. There are other tty-based tools in the tools-subdirectory
- contributed by Michael Knigge (imon), Volker Götz (imontty) and
- Andreas Kool (isdnmon).
-
- l) For initial testing, you can set the verbose-level to 2 (default: 0).
- Then all incoming calls are logged, even if they are not addressed
- to one of the configured net-interfaces:
- isdnctrl verbose 2
-
- Now you are ready! A ping to the set address should now result in an
- automatic dial-out (look at syslog kernel-messages).
- The phone numbers and EAZs can be assigned at any time with isdnctrl.
- You can add as many interfaces as you like with addif following the
- directions above. Of course, there may be some limitations. But we have
- tested as many as 20 interfaces without any problem. However, if you
- don't give an interface name to addif, the kernel will assign a name
- which starts with "eth". The number of "eth"-interfaces is limited by
- the kernel.
-
-5. Additional options for isdnctrl:
-
- "isdnctrl secure <InterfaceName> on"
- Only incoming calls, for which the caller-id is listed in the access
- list of the interface are accepted. You can add caller-id's With the
- command "isdnctrl addphone <InterfaceName> in <caller-id>"
- Euro-ISDN does not transmit the leading '0' of the caller-id for an
- incoming call, therefore you should configure it accordingly.
- If the real number for the dialout e.g. is "09311234567" the number
- to configure here is "9311234567". The pattern-match function
- works similar to the shell mechanism.
-
- ? one arbitrary digit
- * zero or arbitrary many digits
- [123] one of the digits in the list
- [1-5] one digit between '1' and '5'
- a '^' as the first character in a list inverts the list
-
-
- "isdnctrl secure <InterfaceName> off"
- Switch off secure operation (default).
-
- "isdnctrl ihup <InterfaceName> [on|off]"
- Switch the hang-up-timer for incoming calls on or off.
-
- "isdnctrl eaz <InterfaceName>"
- Returns the EAZ of an interface.
-
- "isdnctrl delphone <InterfaceName> in|out <number>"
- Deletes a number from one of the access-lists of the interface.
-
- "isdnctrl delif <InterfaceName>"
- Removes the interface (and possible slaves) from the kernel.
- (You have to unregister it with "ifconfig <InterfaceName> down" before).
-
- "isdnctrl callback <InterfaceName> [on|off]"
- Switches an interface to callback-mode. In this mode, an incoming call
- will be rejected and after this the remote-station will be called. If
- you test this feature by using ping, some routers will re-dial very
- quickly, so that the callback from isdn4linux may not be recognized.
- In this case use ping with the option -i <sec> to increase the interval
- between echo-packets.
-
- "isdnctrl cbdelay <InterfaceName> [seconds]"
- Sets the delay (default 5 sec) between an incoming call and start of
- dialing when callback is enabled.
-
- "isdnctrl cbhup <InterfaceName> [on|off]"
- This enables (default) or disables an active hangup (reject) when getting an
- incoming call for an interface which is configured for callback.
-
- "isdnctrl encap <InterfaceName> <EncapType>"
- Selects the type of packet-encapsulation. The encapsulation can be changed
- only while an interface is down.
-
- At the moment the following values are supported:
-
- rawip (Default) Selects raw-IP-encapsulation. This means, MAC-headers
- are stripped off.
- ip IP with type-field. Same as IP but the type-field of the MAC-header
- is preserved.
- x25iface X.25 interface encapsulation (first byte semantics as defined in
- ../networking/x25-iface.txt). Use this for running the linux
- X.25 network protocol stack (AF_X25 sockets) on top of isdn.
- cisco-h A special-mode for communicating with a Cisco, which is configured
- to do "hdlc"
- ethernet No stripping. Packets are sent with full MAC-header.
- The Ethernet-address of the interface is faked, from its
- IP-address: fc:fc:i1:i2:i3:i4, where i1-4 are the IP-addr.-values.
- syncppp Synchronous PPP
-
- uihdlc HDLC with UI-frame-header (for use with DOS ISPA, option -h1)
-
-
- NOTE: x25iface encapsulation is currently experimental. Please
- read README.x25 for further details
-
-
- Watching packets, using standard-tcpdump will fail for all encapsulations
- except ethernet because tcpdump does not know how to handle packets
- without MAC-header. A patch for tcpdump is included in the utility-package
- mentioned above.
-
- "isdnctrl l2_prot <InterfaceName> <L2-ProtocolName>"
- Selects a layer-2-protocol.
- (With the ICN-driver and the HiSax-driver, "x75i" and "hdlc" is available.
- With other drivers, "x75ui", "x75bui", "x25dte", "x25dce" may be
- possible too. See README.x25 for x25 related l2 protocols.)
-
- isdnctrl l3_prot <InterfaceName> <L3-ProtocolName>
- The same for layer-3. (At the moment only "trans" is allowed)
-
- "isdnctrl list <InterfaceName>"
- Shows all parameters of an interface and the charge-info.
- Try "all" as the interface name.
-
- "isdnctrl hangup <InterfaceName>"
- Forces hangup of an interface.
-
- "isdnctrl bind <InterfaceName> <DriverId>,<ChannelNumber> [exclusive]"
- If you are using more than one ISDN card, it is sometimes necessary to
- dial out using a specific card or even preserve a specific channel for
- dialout of a specific net-interface. This can be done with the above
- command. Replace <DriverId> by whatever you assigned while loading the
- module. The <ChannelNumber> is counted from zero. The upper limit
- depends on the card used. At the moment no card supports more than
- 2 channels, so the upper limit is one.
-
- "isdnctrl unbind <InterfaceName>"
- unbinds a previously bound interface.
-
- "isdnctrl busreject <DriverId> on|off"
- If switched on, isdn4linux replies a REJECT to incoming calls, it
- cannot match to any configured interface.
- If switched off, nothing happens in this case.
- You normally should NOT enable this feature, if the ISDN adapter is not
- the only device connected to the S0-bus. Otherwise it could happen that
- isdn4linux rejects an incoming call, which belongs to another device on
- the bus.
-
- "isdnctrl addslave <InterfaceName> <SlaveName>
- Creates a slave interface for channel-bundling. Slave interfaces are
- not seen by the kernel, but their ISDN-part can be configured with
- isdnctrl as usual. (Phone numbers, EAZ/MSN, timeouts etc.) If more
- than two channels are to be bundled, feel free to create as many as you
- want. InterfaceName must be a real interface, NOT a slave. Slave interfaces
- start dialing, if the master interface resp. the previous slave interface
- has a load of more than 7000 cps. They hangup if the load goes under 7000
- cps, according to their "huptimeout"-parameter.
-
- "isdnctrl sdelay <InterfaceName> secs."
- This sets the minimum time an Interface has to be fully loaded, until
- it sends a dial-request to its slave.
-
- "isdnctrl dial <InterfaceName>"
- Forces an interface to start dialing even if no packets are to be
- transferred.
-
- "isdnctrl mapping <DriverId> MSN0,MSN1,MSN2,...MSN9"
- This installs a mapping table for EAZ<->MSN-mapping for a single line.
- Missing MSN's have to be given as "-" or can be omitted, if at the end
- of the commandline.
- With this command, it's now possible to have an interface listening to
- mixed 1TR6- and Euro-Type lines. In this case, the interface has to be
- configured to a 1TR6-type EAZ (one digit). The mapping is also valid
- for tty-emulation. Seen from the interface/tty-level the mapping
- CAN be used, however it's possible to use single tty's/interfaces with
- real MSN's (more digits) also, in which case the mapping will be ignored.
- Here is an example:
-
- You have a 1TR6-type line with base-nr. 1234567 and a Euro-line with
- MSN's 987654, 987655 and 987656. The DriverId for the Euro-line is "EURO".
-
- isdnctrl mapping EURO -,987654,987655,987656,-,987655
- ...
- isdnctrl eaz isdn0 1 # listen on 12345671(1tr6) and 987654(euro)
- ...
- isdnctrl eaz isdn1 4 # listen on 12345674(1tr6) only.
- ...
- isdnctrl eaz isdn2 987654 # listen on 987654(euro) only.
-
- Same scheme is used with AT&E... at the tty's.
-
-6. If you want to write a new low-level-driver, you are welcome.
- The interface to the link-level-module is described in the file INTERFACE.
- If the interface should be expanded for any reason, don't do it
- on your own, send me a mail containing the proposed changes and
- some reasoning about them.
- If other drivers will not be affected, I will include the changes
- in the next release.
- For developers only, there is a second mailing-list. Write to me
- (fritz@isdn4linux.de), if you want to join that list.
-
-Have fun!
-
- -Fritz
-