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Based on kernel version 3.13. Page generated on 2014-01-20 22:03 EST.

1	README for the ISDN-subsystem
2	
3	1. 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	
319	2 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	
327	3. 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	
332	4. 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	
341	5. 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	
423	5. 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	
586	6. 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	
596	Have fun!
597	
598	 -Fritz
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