Acc Module

Jiri Kuthan

   iptel.org
   <jiri@iptel.org>

Bogdan-Andrei Iancu

   voice-system.ro
   <bogdan@voice-system.ro>

Ramona-Elena Modroiu

   rosdev.ro
   <ramona@rosdev.ro>

Edited by

Bogdan-Andrei Iancu

   voice-system.ro
   <bogdan@voice-system.ro>

   Copyright © 2002, 2003 FhG FOKUS

   Copyright © 2004, 2006 voice-system.ro
   Revision History
   Revision $Revision: 5231 $ $Date: 2008-08-06 12:08:33 +0200
                              (Mi, 06 Aug 2008) $
     __________________________________________________________

   Table of Contents

   1. Admin Guide

        1.1. Overview

              1.1.1. General Example

        1.2. Extra accounting

              1.2.1. Overview
              1.2.2. Definitions and syntax
              1.2.3. How it works

        1.3. Multi Call-Legs accounting

              1.3.1. Overview
              1.3.2. Configuration
              1.3.3. Logged data

        1.4. Dependencies

              1.4.1. Kamailio Modules
              1.4.2. External Libraries or Applications

        1.5. Exported Parameters

              1.5.1. early_media (integer)
              1.5.2. failed_transaction_flag (integer)
              1.5.3. report_ack (integer)
              1.5.4. report_cancels (integer)
              1.5.5. detect_direction (integer)
              1.5.6. multi_leg_info (string)
              1.5.7. log_flag (integer)
              1.5.8. log_missed_flag (integer)
              1.5.9. log_level (integer)
              1.5.10. log_facility (string)
              1.5.11. log_extra (string)
              1.5.12. radius_config (string)
              1.5.13. radius_flag (integer)
              1.5.14. radius_missed_flag (integer)
              1.5.15. service_type (integer)
              1.5.16. radius_extra (string)
              1.5.17. db_flag (integer)
              1.5.18. db_missed_flag (integer)
              1.5.19. db_table_acc (string)
              1.5.20. db_table_missed_calls (string)
              1.5.21. db_url (string)
              1.5.22. acc_method_column (string)
              1.5.23. acc_from_tag_column (string)
              1.5.24. acc_to_tag_column (string)
              1.5.25. acc_callid_column (string)
              1.5.26. acc_sip_code_column (string)
              1.5.27. acc_sip_reason_column (string)
              1.5.28. acc_time_column (string)
              1.5.29. db_extra (string)
              1.5.30. diameter_flag (integer)
              1.5.31. diameter_missed_flag (integer)
              1.5.32. diameter_client_host (string)
              1.5.33. diameter_client_port (int)
              1.5.34. diameter_extra (string)

        1.6. Exported Functions

              1.6.1. acc_log_request(comment)
              1.6.2. acc_db_request(comment, table)
              1.6.3. acc_rad_request(comment)
              1.6.4. acc_diam_request(comment)

   2. Frequently Asked Questions

   List of Examples

   1.1. early_media example
   1.2. failed_transaction_flag example
   1.3. report_ack example
   1.4. report_cancels example
   1.5. detect_direction example
   1.6. multi_leg_info example
   1.7. log_flag example
   1.8. log_missed_flag example
   1.9. log_level example
   1.10. log_facility example
   1.11. log_extra example
   1.12. radius_config example
   1.13. radius_flag example
   1.14. radius_missed_flag example
   1.15. service_type example
   1.16. radius_extra example
   1.17. db_flag example
   1.18. db_missed_flag example
   1.19. db_table_acc example
   1.20. db_table_missed_calls example
   1.21. db_url example
   1.22. acc_method_column example
   1.23. acc_from_tag_column example
   1.24. acc_to_tag_column example
   1.25. acc_callid_column example
   1.26. acc_sip_code_column example
   1.27. acc_sip_reason_column example
   1.28. acc_time_column example
   1.29. db_extra example
   1.30. diameter_flag example
   1.31. diameter_missed_flag example
   1.32. diameter_client_host example
   1.33. diameter_client_host example
   1.34. diameter_extra example
   1.35. acc_log_request usage
   1.36. acc_db_request usage
   1.37. acc_rad_request usage
   1.38. acc_diam_request usage

Chapter 1. Admin Guide

1.1. Overview

   ACC module is used to account transactions information to
   different backends like syslog, SQL, RADIUS and DIAMETER (beta
   version).

   To account a transaction and to choose which set of backends to
   be used, the script writer just has to set some flags (see the
   module parameters section for flag definitions Section 1.5,
   "Exported Parameters"). If the accounting flag for a specific
   backend is set, the acc module will then report on completed
   transaction. A typical usage of the module takes no
   acc-specific script command -- the functionality binds
   invisibly through transaction processing. Script writers just
   need to mark the transaction for accounting with proper
   setflag. Even so, the module allows the script writter to force
   accounting in special cases via some script functions.

   The accounting module will log by default a fixed set of
   attributes for the transaction - if you customize your
   accounting by adding more information to be logged, please see
   the next chapter about extra accounting - Section 1.2, "Extra
   accounting".

   The fixed minimal accounting information is:
     * Request Method name
     * From header TAG parameter
     * To header TAG parameter
     * Call-Id
     * 3-digit Status code from final reply
     * Reason phrase from final reply
     * Time stamp when transaction was completed

   If a value is not present in request, the empty string is
   accounted instead.

   Note that:
     * A single INVITE may produce multiple accounting reports --
       that's due to SIP forking feature.
     * All flags related to accounting need to be set in request
       processing route - only the "missed-call" flag may be
       toggled from other types of routes.
     * There is no session/dialog accounting (yet) -- Kamailio
       maintains no sessions. If one needs to correlate INVITEs
       with BYEs for generating proper CDRs for example for
       purpose of billing, then it is better done in the entity
       which processes accounting information.
     * If a UA fails in middle of conversation, a proxy will never
       find out about it. In general, a better practice is to
       account from an end-device (such as PSTN gateway), which
       best knows about call status (including media status and
       PSTN status in case of the gateway).

   The SQL backend support is compiled in the module. For RADIUS
   and DIAMETER you need to enable it by recompiling the module
   with properly set defines: uncomment the RAD_ACC or DDIAM_ACC
   lines in modules/acc/Makefile. To compile RADIUS support, you
   need to have radiusclient-ng (only versions higher or equal to
   0.5.0) installed on your system which is available from
   http://developer.berlios.de/projects/radiusclient-ng/. The
   radius client needs to be configured properly. To do so, use
   the template at etc/radiusclient.conf and make sure that
   module's radius_config parameter points to its location. In
   particular, accounting secret must match that one configured in
   server and proper dictionary is used (one is available at
   etc/sip_dictionary). Also note that Debian radiusclient-ng uses
   /var/run/radius.seq as seqfile but Kamailio Debian init script
   expects /var/run/kamailio/kamailio_radius.seq, so is needed to
   change it in radiusclient-ng configuration or in Kamailio
   Debian init script (if not, Kamailio can't create the seq file
   when not running as root). Uses along with FreeRadius (
   http://www.freeradius.org/) and Radiator (
   http://www.open.com.au/radiator/) servers have been reported to
   us.

   NOTE: diameter support was developed for DISC (DIameter Server
   Client project at http://developer.berlios.de/projects/disc/).
   This project seems to be no longer maintained and DIAMETER
   specifications were updated in the meantime. Thus, the DIAMETER
   part in the module is obsolete and needs rework to be usable
   with opendiameter or other DIAMETER servers.

1.1.1. General Example

loadmodule "modules/acc/acc.so"
modparam("acc", "log_level", 1)
modparam("acc", "log_flag", 1)

if (uri=~"sip:+40") /* calls to Romania */ {
    if (!proxy_authorize("sip_domain.net" /* realm */,
    "subscriber" /* table name */))  {
        proxy_challenge("sip_domain.net" /* realm */, "0" /* no qop */ )
;
        exit;
    }

    if (method=="INVITE" && !check_from()) {
        log("from!=digest\n");
        sl_send_reply("403","Forbidden");
    }

    setflag(1); /* set for accounting (the same value as in log_flag!)
    t_relay();  /* enter stateful mode now */
};

1.2. Extra accounting

1.2.1. Overview

   Along the static default information, ACC modules allows
   dynamical selection of extra information to be logged. This
   allows you to log any pseudo-variable (AVPs, parts of the
   request, etc).

1.2.2. Definitions and syntax

   Selection of extra information is done via xxx_extra parameters
   by specifying the names of additional information you want to
   log. This information is defined via pseudo-variables and may
   include headers, AVPs values or other message or system values.
   The syntax of the parameter is:
     * xxx_extra = extra_definition (';'extra_definition)*
     * extra_definition = log_name '=' pseudo_variable

   The full list of supported pseudo-variables in Kamailio is
   available at:
   http://kamailio.org/dokuwiki/doku.php/pseudovariables:devel

   Via log_name you define how/where the data will be logged. Its
   meaning depends of the accounting support which is used:
     * LOG accounting - log_name will be just printed along with
       the data in log_name=data format;
     * DB accounting - log_name will be the name of the DB column
       where the data will be stored.IMPORTANT: add in db acc
       table the columns corresponding to each extra data;
     * RADIUS accounting - log_name will be the AVP name used for
       packing the data into RADIUS message. The log_name will be
       translated to AVP number via the dictionary. IMPORTANT: add
       in RADIUS dictionary the log_name attribute.
     * DIAMETER accounting - log_name will be the AVP code used
       for packing the data into DIAMETER message. The AVP code is
       given directly as integer, since DIAMETER has no dictionary
       support yet. IMPORTANT: log_name must be a number.

1.2.3. How it works

   Some pseudo variables may return more than one value (like
   headers or AVPs). In this case, the returned values are
   embedded in a single string in a comma-separated format.

1.3. Multi Call-Legs accounting

1.3.1. Overview

   A SIP call can have multiple legs due forwarding actions. For
   example user A calls user B which forwards the call to user C.
   There is only one SIP call but with 2 legs ( A to B and B to
   C). Accounting the legs of a call is required for proper
   billing of the calls (if C is a PSTN number and the call is
   billed, user B must pay for the call - as last party modifing
   the call destination-, and not A - as initiator of the call.
   Call forwarding on server is only one example which shows the
   necessity of the having an accounting engine with multiple legs
   support.

1.3.2. Configuration

   First how it works: The idea is to have a set of AVPs and for
   each call leg to store a set of values in the AVPs. The meaning
   of the AVP content is stricly decided by the script writer - it
   can be the origin and source of the leg, its status or any
   other related information. If you have a set of 4 AVPS (AVP1,
   AVP2, AVP3, AVP4), then for the "A call B and B forwards to C"
   example, you need to set a different set of values for the AVPs
   for each leg ([A,B] and [B,C]) . The script writer must take
   care and properly insert all these AVP from the script (in
   proper order and with the correct type).

   When the accounting information for the call will be
   written/sent, all the call-leg pairs will be added (based on
   the found AVP sets).

   By default, the multiple call-leg support is disabled - it can
   be enabled just be setting the per-leg set of AVPs via the
   multi_leg_info module parameter.

1.3.3. Logged data

   For each call, all the values of the AVP set (which defines a
   call-leg) will be logged. How the information will be actually
   logged, depends of the data backend:
     * syslog -- all leg-sets will be added to one record string
       as AVP1=xxx, AVP2=xxxx ,... sets.
     * database -- each pair will be separately logged (due DB
       data structure constraints); several records will be
       written, the difference between them being only the fields
       corresponding to the call-leg info.

Note
       You will need to add in your DB (all acc related tables)
       the colums for call-leg info (a column for each AVP of the
       set).
     * Radius -- all sets will be added to the same Radius
       accounting message as RADIUS AVPs - for each call-leg a set
       of RADIUS AVPs will be added (corresponding to the per-leg
       AVP set)

Note
       You will need to add in your dictionary the RADIUS AVPs
       used in call-leg AVP set definition.
     * Diameter same as for RADIUS.

1.4. Dependencies

1.4.1. Kamailio Modules

   The module depends on the following modules (in the other words
   the listed modules must be loaded before this module):
     * tm -- Transaction Manager
     * a database module -- If SQL support is used.
     * rr -- Record Route, if "detect_direction" module parameter
       is enabled.

1.4.2. External Libraries or Applications

   The following libraries or applications must be installed
   before running Kamailio with this module loaded:
     * radiusclient-ng 0.5.0 or higher -- if compiled with RADIUS
       support. See
       http://developer.berlios.de/projects/radiusclient-ng/.

1.5. Exported Parameters

1.5.1. early_media (integer)

   Should be early media (any provisional reply with body)
   accounted too ?

   Default value is 0 (no).

   Example 1.1. early_media example
modparam("acc", "early_media", 1)

1.5.2. failed_transaction_flag (integer)

   Per transaction flag which says if the transaction should be
   accounted also in case of failure (status>=300).

   Default value is not-set (no flag).

   Example 1.2. failed_transaction_flag example
modparam("acc", "failed_transaction_flag", 4)

1.5.3. report_ack (integer)

   Shall acc attempt to account e2e ACKs too ? Note that this is
   really only an attempt, as e2e ACKs may take a different path
   (unless RR enabled) and mismatch original INVITE (e2e ACKs are
   a separate transaction).

   Default value is 0 (no).

   Example 1.3. report_ack example
modparam("acc", "report_ack", 1)

1.5.4. report_cancels (integer)

   By default, CANCEL reporting is disabled -- most accounting
   applications wants to see INVITE's cancellation status. Turn on
   if you explicitly want to account CANCEL transactions.

   Default value is 0 (no).

   Example 1.4. report_cancels example
modparam("acc", "report_cancels", 1)

1.5.5. detect_direction (integer)

   Controlles the direction detection for sequential requests. If
   enabled (non zero value), for sequential requests with upstream
   direction (from callee to caller), the FROM and TO will be
   swapped (the direction will be preserved as in the original
   request).

   It affects all values related to TO and FROM headers (body,
   URI, username, domain, TAG).

   Default value is 0 (disabled).

   Example 1.5. detect_direction example
modparam("acc", "detect_direction", 1)

1.5.6. multi_leg_info (string)

   Defines the AVP set to be used in per-call-leg accounting. See
   Section 1.3, "Multi Call-Legs accounting" for a detailed
   description of the Multi Call-Legs accounting.

   If empty, the multi-leg accounting support will be disabled.

   Default value is 0 (disabled).

   Example 1.6. multi_leg_info example
# for syslog-based accounting, use any text you want to be printed
modparam("acc", "multi_leg_info",
    "text1=$avp(src);text2=$avp(dst)")
# for mysql-based accounting, use the names of the columns
modparam("acc", "multi_leg_info",
    "leg_src=$avp(src);leg_dst=$avp(dst)")
# for RADIUS-based accounting, use the names of the RADIUS AVPs
modparam("acc", "multi_leg_info",
    "RAD_LEG_SRC=$avp(src);RAD_LEG_SRC=$avp(dst)")
# for DIAMETER-based accounting, use the DIAMETER AVP ID (as integer)
modparam("acc", "multi_leg_info",
    "2345=$avp(src);2346=$avp(dst)")

1.5.7. log_flag (integer)

   Request flag which needs to be set to account a transaction via
   syslog.

   Default value is not-set (no flag).

   Example 1.7. log_flag example
modparam("acc", "log_flag", 2)

1.5.8. log_missed_flag (integer)

   Request flag which needs to be set to account missed calls via
   syslog.

   Default value is not-set (no flag).

   Example 1.8. log_missed_flag example
modparam("acc", "log_missed_flag", 3)

1.5.9. log_level (integer)

   Log level at which accounting messages are issued to syslog.

   Default value is L_NOTICE.

   Example 1.9. log_level example
modparam("acc", "log_level", 2)   # Set log_level to 2

1.5.10. log_facility (string)

   Log facility to which accounting messages are issued to syslog.
   This allows to easily seperate the accounting specific logging
   from the other log messages.

   Default value is LOG_DAEMON.

   Example 1.10. log_facility example
modparam("acc", "log_facility", "LOG_DAEMON")

1.5.11. log_extra (string)

   Extra values to be logged.

   Default value is NULL.

   Example 1.11. log_extra example
modparam("acc", "log_extra", "ua=$hdr(User-Agent);uuid=$avp(i:123)")

1.5.12. radius_config (string)

   This parameter is radius specific. Path to radius client
   configuration file, set the referred config file correctly and
   specify there address of server, shared secret (should equal
   that in /usr/local/etc/raddb/clients for freeRadius servers)
   and dictionary, see etc for an example of config file and
   dictionary.

   If the parameter is set to empty string, the RADIUS accounting
   support will be disabled (even if compiled).

   Default value is "NULL".

   Example 1.12. radius_config example
modparam("acc", "radius_config", "/etc/radiusclient/radiusclient.conf")

1.5.13. radius_flag (integer)

   Request flag which needs to be set to account a transaction --
   RADIUS specific.

   Default value is not-set (no flag).

   Example 1.13. radius_flag example
modparam("acc", "radius_flag", 2)

1.5.14. radius_missed_flag (integer)

   Request flag which needs to be set to account missed calls --
   RADIUS specific.

   Default value is not-set (no flag).

   Example 1.14. radius_missed_flag example
modparam("acc", "radius_missed_flag", 3)

1.5.15. service_type (integer)

   Radius service type used for accounting.

   Default value is 15 (SIP).

   Example 1.15. service_type example
modparam("acc", "service_type", 16)

1.5.16. radius_extra (string)

   Extra values to be logged via RADIUS - RADIUS specific.

   Default value is NULL.

   Example 1.16. radius_extra example
modparam("acc", "radius_extra", "via=$hdr(Via[*]); email=$avp(s:email)")

1.5.17. db_flag (integer)

   Request flag which needs to be set to account a transaction --
   database specific.

   Default value is not-set (no flag).

   Example 1.17. db_flag example
modparam("acc", "db_flag", 2)

1.5.18. db_missed_flag (integer)

   Request flag which needs to be set to account missed calls --
   database specific.

   Default value is not-set (no flag).

   Example 1.18. db_missed_flag example
modparam("acc", "db_missed_flag", 3)

1.5.19. db_table_acc (string)

   Table name of accounting successfull calls -- database
   specific.

   Default value is "acc"

   Example 1.19. db_table_acc example
modparam("acc", "db_table_acc", "myacc_table")

1.5.20. db_table_missed_calls (string)

   Table name for accounting missed calls -- database specific.

   Default value is "missed_calls"

   Example 1.20. db_table_missed_calls example
modparam("acc", "db_table_missed_calls", "myMC_table")

1.5.21. db_url (string)

   SQL address -- database specific. If is set to NULL or emty
   string, the SQL support is disabled.

   Default value is "NULL" (SQL disabled).

   Example 1.21. db_url example
modparam("acc", "db_url", "mysql://user:password@localhost/openser")

1.5.22. acc_method_column (string)

   Column name in accounting table to store the request's method
   name as string.

   Default value is "method".

   Example 1.22. acc_method_column example
modparam("acc", "acc_method_column", "method")

1.5.23. acc_from_tag_column (string)

   Column name in accounting table to store the From header TAG
   parameter.

   Default value is "from_tag".

   Example 1.23. acc_from_tag_column example
modparam("acc", "acc_from_tag_column", "from_tag")

1.5.24. acc_to_tag_column (string)

   Column name in accounting table to store the To header TAG
   parameter.

   Default value is "to_tag".

   Example 1.24. acc_to_tag_column example
modparam("acc", "acc_to_tag_column", "to_tag")

1.5.25. acc_callid_column (string)

   Column name in accounting table to store the request's Callid
   value.

   Default value is "callid".

   Example 1.25. acc_callid_column example
modparam("acc", "acc_callid_column", "callid")

1.5.26. acc_sip_code_column (string)

   Column name in accounting table to store the final reply's
   numric code value in string format.

   Default value is "sip_code".

   Example 1.26. acc_sip_code_column example
modparam("acc", "acc_sip_code_column", "sip_code")

1.5.27. acc_sip_reason_column (string)

   Column name in accounting table to store the final reply's
   reason phrase value.

   Default value is "sip_reason".

   Example 1.27. acc_sip_reason_column example
modparam("acc", "acc_sip_reason_column", "sip_reason")

1.5.28. acc_time_column (string)

   Column name in accounting table to store the time stamp of the
   transaction completion in date-time format.

   Default value is "time".

   Example 1.28. acc_time_column example
modparam("acc", "acc_time_column", "time")

1.5.29. db_extra (string)

   Extra values to be logged into database - DB specific.

   Default value is NULL.

   Example 1.29. db_extra example
modparam("acc", "db_extra", "ct=$hdr(Content-type); email=$avp(s:email)"
)

1.5.30. diameter_flag (integer)

   Request flag which needs to be set to account a transaction --
   DIAMETER specific.

   Default value is not-set (no flag).

   Example 1.30. diameter_flag example
modparam("acc", "diameter_flag", 2)

1.5.31. diameter_missed_flag (integer)

   Request flag which needs to be set to account missed calls --
   DIAMETER specific.

   Default value is not-set (no flag).

   Example 1.31. diameter_missed_flag example
modparam("acc", "diameter_missed_flag", 3)

1.5.32. diameter_client_host (string)

   Hostname of the machine where the DIAMETER Client is running --
   DIAMETER specific.

   Default value is "localhost".

   Example 1.32. diameter_client_host example
modparam("acc", "diameter_client_host", "3a_server.net")

1.5.33. diameter_client_port (int)

   Port number where the Diameter Client is listening -- DIAMETER
   specific.

   Default value is 3000.

   Example 1.33. diameter_client_host example
modparam("acc", "diameter_client_port", 3000)

1.5.34. diameter_extra (string)

   Extra values to be logged via DIAMETER - DIAMETER specific.

   Default value is NULL.

   Example 1.34. diameter_extra example
modparam("acc", "diameter_extra", "7846=$hdr(Content-type);7847=$avp(s:e
mail)")

1.6. Exported Functions

1.6.1.  acc_log_request(comment)

   acc_request reports on a request, for example, it can be used
   to report on missed calls to off-line users who are replied 404
   - Not Found. To avoid multiple reports on UDP request
   retransmission, you would need to embed the action in stateful
   processing.

   Meaning of the parameters is as follows:
     * comment - Comment to be appended.

   This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.

   Example 1.35. acc_log_request usage
...
acc_log_request("Some comment");
...

1.6.2.  acc_db_request(comment, table)

   Like acc_log_request, acc_db_request reports on a request. The
   report is sent to database at "db_url", in the table referred
   to in the second action parameter.

   Meaning of the parameters is as follows:
     * comment - Comment to be appended.
     * table - Database table to be used.

   This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.

   Example 1.36. acc_db_request usage
...
acc_log_request("Some comment", "Some table");
...

1.6.3.  acc_rad_request(comment)

   Like acc_log_request, acc_rad_request reports on a request. It
   reports to radius server as configured in "radius_config".

   Meaning of the parameters is as follows:
     * comment - Comment to be appended.

   This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.

   Example 1.37. acc_rad_request usage
...
acc_rad_request("Some comment");
...

1.6.4.  acc_diam_request(comment)

   Like acc_log_request, acc_diam_request reports on a request. It
   reports to the configured Diameter server.

   Meaning of the parameters is as follows:
     * comment - Comment to be appended.

   This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.

   Example 1.38. acc_diam_request usage
...
acc_diam_request("Some comment");
...

Chapter 2. Frequently Asked Questions

   2.1.

       What happend with old log_fmt parameter

       The parameter became obsolete with the restructure of the data
       logged by ACC module (refer to the Overview chapter). For
       similar behaviour you can use the extra accouting (see the
       coresponding chapter).

   2.2.

       What happend with old multi_leg_enabled parameter

       The parameter becaome obsolete by the addition of the new
       multi_leg_info parameter. The multi-leg accouting is
       automatically enabled when multi_leg_info is defined.

   2.3.

       What happend with old src_leg_avp_id and dst_leg_avp_id
       parameters

       The parameter was replaced by the more generic new parameter
       multi_leg_info. This allows logging (per-leg) of more
       information than just dst and src.

   2.4.

       Where can I find more about Kamailio?

       Take a look at http://www.kamailio.org/.

   2.5.

       Where can I post a question about this module?

       First at all check if your question was already answered on one
       of our mailing lists:
         * User Mailing List -
           http://lists.kamailio.org/cgi-bin/mailman/listinfo/users
         * Developer Mailing List -
           http://lists.kamailio.org/cgi-bin/mailman/listinfo/devel

       E-mails regarding any stable Kamailio release should be sent to
       <users@lists.kamailio.org> and e-mails regarding development
       versions should be sent to <devel@lists.kamailio.org>.

       If you want to keep the mail private, send it to
       <team@lists.kamailio.org>.

   2.6.

       How can I report a bug?

       Please follow the guidelines provided at:
       http://sourceforge.net/tracker/?group_id=139143.
