128 lines
6.1 KiB
Plaintext
128 lines
6.1 KiB
Plaintext
The isdn diversion services are a supporting module working together with
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the isdn4linux and the HiSax module for passive cards.
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Active cards, TAs and cards using a own or other driver than the HiSax
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module need to be adapted to the HL<->LL interface described in a separate
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document. The diversion services may be used with all cards supported by
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the HiSax driver.
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The diversion kernel interface and controlling tool divertctrl were written
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by Werner Cornelius (werner@isdn4linux.de or werner@titro.de) under the
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GNU General Public License.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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Table of contents
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=================
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1. Features of the i4l diversion services
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(Or what can the i4l diversion services do for me)
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2. Required hard- and software
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3. Compiling, installing and loading/unloading the module
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Tracing calling and diversion information
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4. Tracing calling and diversion information
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5. Format of the divert device ASCII output
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1. Features of the i4l diversion services
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(Or what can the i4l diversion services do for me)
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The i4l diversion services offers call forwarding and logging normally
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only supported by isdn phones. Incoming calls may be diverted
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unconditionally (CFU), when not reachable (CFNR) or on busy condition
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(CFB).
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The diversions may be invoked statically in the providers exchange
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as normally done by isdn phones. In this case all incoming calls
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with a special (or all) service identifiers are forwarded if the
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forwarding reason is met. Activated static services may also be
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interrogated (queried).
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The i4l diversion services additionally offers a dynamic version of
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call forwarding which is not preprogrammed inside the providers exchange
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but dynamically activated by i4l.
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In this case all incoming calls are checked by rules that may be
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compared to the mechanism of ipfwadm or ipchains. If a given rule matches
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the checking process is finished and the rule matching will be applied
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to the call.
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The rules include primary and secondary service identifiers, called
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number and subaddress, callers number and subaddress and whether the rule
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matches to all filtered calls or only those when all B-channel resources
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are exhausted.
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Actions that may be invoked by a rule are ignore, proceed, reject,
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direct divert or delayed divert of a call.
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All incoming calls matching a rule except the ignore rule a reported and
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logged as ASCII via the proc filesystem (/proc/net/isdn/divert). If proceed
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is selected the call will be held in a proceeding state (without ringing)
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for a certain amount of time to let an external program or client decide
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how to handle the call.
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2. Required hard- and software
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For using the i4l diversion services the isdn line must be of a EURO/DSS1
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type. Additionally the i4l services only work together with the HiSax
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driver for passive isdn cards. All HiSax supported cards may be used for
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the diversion purposes.
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The static diversion services require the provider having static services
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CFU, CFNR, CFB activated on an MSN-line. The static services may not be
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used on a point-to-point connection. Further the static services are only
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available in some countries (for example germany). Countries requiring the
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keypad protocol for activating static diversions (like the netherlands) are
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not supported but may use the tty devices for this purpose.
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The dynamic diversion services may be used in all countries if the provider
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enables the feature CF (call forwarding). This should work on both MSN- and
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point-to-point lines.
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To add and delete rules the additional divertctrl program is needed. This
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program is part of the isdn4kutils package.
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3. Compiling, installing and loading/unloading the module
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Tracing calling and diversion information
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To compile the i4l code with diversion support you need to say yes to the
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DSS1 diversion services when selecting the i4l options in the kernel
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config (menuconfig or config).
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After having properly activated a make modules and make modules_install all
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required modules will be correctly installed in the needed modules dirs.
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As the diversion services are currently not included in the scripts of most
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standard distributions you will have to add a "insmod dss1_divert" after
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having loaded the global isdn module.
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The module can be loaded without any command line parameters.
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If the module is actually loaded and active may be checked with a
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"cat /proc/modules" or "ls /proc/net/isdn/divert". The divert file is
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dynamically created by the diversion module and removed when the module is
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unloaded.
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4. Tracing calling and diversion information
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You also may put a "cat /proc/net/isdn/divert" in the background with the
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output redirected to a file. Then all actions of the module are logged.
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The divert file in the proc system may be opened more than once, so in
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conjunction with inetd and a small remote client on other machines inside
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your network incoming calls and reactions by the module may be shown on
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every listening machine.
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If a call is reported as proceeding an external program or client may
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specify during a certain amount of time (normally 4 to 10 seconds) what
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to do with that call.
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To unload the module all open files to the device in the proc system must
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be closed. Otherwise the module (and isdn.o) may not be unloaded.
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5. Format of the divert device ASCII output
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To be done later
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