1. Acc Module

Jiri Kuthan

   iptel.org
   <jiri@iptel.org>

   Copyright © 2002, 2003 FhG FOKUS
     __________________________________________________________________

   1.1. Overview
   1.2. Dependencies
   1.3. Parameters

        1.3.1. log_level (integer)
        1.3.2. log_fmt (string)
        1.3.3. early_media (integer)
        1.3.4. failed_transactions (integer)
        1.3.5. log_flag (integer)
        1.3.6. log_missed_flag (integer)
        1.3.7. report_ack (integer)
        1.3.8. report_cancels (integer)
        1.3.9. radius_config (string)
        1.3.10. service_type (integer)
        1.3.11. radius_flag (integer)
        1.3.12. radius_missed_flag (integer)
        1.3.13. db_url (string)
        1.3.14. db_flag (integer)
        1.3.15. db_missed_flag (integer)
        1.3.16. diameter_flag (integer)
        1.3.17. diameter_missed_flag (integer)
        1.3.18. diameter_client_host (string)
        1.3.19. diameter_client_port (int)

   1.4. Functions

        1.4.1. acc_log_request(comment)
        1.4.2. acc_db_request(comment, table)
        1.4.3. acc_rad_request(comment)
        1.4.4. acc_diam_request(comment)

1.1. Overview

   acc module is used to report on transactions to syslog, SQL and RADIUS.

   To report on a transaction using syslog, use "setflag" to mark a
   transaction you are interested in with a flag, load accounting module
   and set its "log_flag" to the same flag number. The acc module will
   then report on completed transaction to syslog. 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.

   What is printed depends on module's "log_fmt" parameter. It's a string
   with characters specifying which parts of request should be printed:
     * c = Call-Id
     * d = To tag (Dst)
     * f = From
     * i = Inbound Request-URI
     * m = Method
     * o = Outbound Request-URI
     * r = fRom
     * s = Status
     * t = To
     * u = digest Username
     * p = username Part of inbound Request-URI

   If a value is not present in request, "n/a" is accounted instead.

Note

     * A single INVITE may produce multiple accounting reports -- that's
       due to SIP forking feature
     * Subsequent ACKs and other requests do not hit the server and can't
       be accounted unless record-routing is enforced. The ACKs assert
       very little useful information anyway and reporting on INVITE's 200
       makes most accounting scenarios happy.
     * There is no session accounting -- ser maintains no sessions. If one
       needs to correlate INVITEs with BYEs for example for purpose of
       billing, then it is better done in the entity which collects
       accounting information. Otherwise, SIP server would have to become
       sessions-stateful, which would very badly impact its scalability.
     * If a UA fails in middle of conversation, a proxy will never learn
       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).

   Support for SQL and RADIUS works analogously. You need to enable it by
   recompiling the module with properly set defines. Uncomment the SQL_ACC
   and RAD_ACC lines in modules/acc/Makefile. To compile SQL support, you
   need to have mysqlclient package on your system. To compile RADIUS
   support, you need to have radiusclient installed on your system
   (version 0.5.0 or higher is required) 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 in
   sip_router/etc/radiusclient.conf and make sure that module's
   radius_config parameter points to its location. Uses along with
   FreeRADIUS and Radiator servers have been reported to us.

   Both mysql and radius libraries must be dynamically linkable. You need
   to configure your OS so that SER, when started, will find them.
   Typically, you do so by manipulating LD_LIBRARY_PATH environment
   variable or configuring ld.so.

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

if (uri=~"sip:+49") /* calls to Germany */ {
    if (!proxy_authorize("iptel.org" /* realm */,
                         "subscriber" /* table name */))  {
        proxy_challenge("iptel.org" /* realm */, "0" /* no qop */ );
        break;
    }

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

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

1.2. Dependencies

   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 (mysql,postgres,dbtext). If compiled with
       database support.

1.3. Parameters

1.3.1. log_level (integer)

   Log level at which accounting messages are issued to syslog.

   Default value is L_NOTICE.

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

1.3.2. log_fmt (string)

   Defines what parts of header fields will be printed to syslog, see
   "overview" for list of accepted values.

   Default value is "miocfs".

   Example 3. log_fmt example
modparam("acc", "log_fmt", "mfs")

1.3.3. early_media (integer)

   Should be early media (183) accounted too ?

   Default value is 0 (no).

   Example 4. early_media example
modparam("acc", "early_media", 1)

1.3.4. failed_transactions (integer)

   This parameter controls whether failed transactions (with final reply
   >= 300) should be accounted too.

   Default value is 0 (no).

   Example 5. failed_transactions example
modparam("acc", "failed_transactions", 1)

1.3.5. log_flag (integer)

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

   Default value is 1.

   Example 6. log_flag example
modparam("acc", "log_flag", 2)

1.3.6. log_missed_flag (integer)

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

   Default value is 2.

   Example 7. log_missed_flag example
modparam("acc", "log_missed_flag", 3)

1.3.7. 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 1 (yes).

   Example 8. report_ack example
modparam("acc", "report_ack", 0)

1.3.8. report_cancels (integer)

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

   Default value is 0 (no).

   Example 9. report_cancels example
modparam("acc", "report_cancels", 1)

1.3.9. 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.

   Default value is “/usr/local/etc/radiusclient/radiusclient.conf”.

   Example 10. radius_config example
modparam("acc", "radius_config", "/etc/radiusclient/radiusclient.conf")

1.3.10. service_type (integer)

   Radius service type used for accounting.

   Default value is 15 (SIP).

   Example 11. service_type example
modparam("acc", "service_type", 16)

1.3.11. radius_flag (integer)

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

   Default value is 1.

   Example 12. radius_flag example
                modparam("acc", "radius_flag", 2)

1.3.12. radius_missed_flag (integer)

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

   Default value is 2.

   Example 13. radius_missed_flag example
modparam("acc", "radius_missed_flag", 3)

1.3.13. db_url (string)

   SQL address -- database specific.

   Default value is "mysql://ser:heslo@localhost/ser"

   Example 14. db_url example
modparam("acc", "db_url", "mysql://user:password@localhost/ser")

1.3.14. db_flag (integer)

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

   Default value is 1.

   Example 15. db_flag example
modparam("acc", "db_flag", 2)

1.3.15. db_missed_flag (integer)

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

   Default value is 2.

   Example 16. db_missed_flag example
modparam("acc", "db_missed_flag", 3)

1.3.16. diameter_flag (integer)

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

   Default value is 1.

   Example 17. diameter_flag example
modparam("acc", "diameter_flag", 2)

1.3.17. diameter_missed_flag (integer)

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

   Default value is 2.

   Example 18. diameter_missed_flag example
modparam("acc", "diameter_missed_flag", 3)

1.3.18. diameter_client_host (string)

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

   Default value is "localhost".

   Example 19. diameter_client_host example
modparam("acc", "diameter_client_host", "iptel.org")

1.3.19. diameter_client_port (int)

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

   Default value is 3000.

   Example 20. diameter_client_host example
modparam("acc", "diameter_client_port", 3000)

1.4. Functions

1.4.1. 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. 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.

   Example 21. acc_log_request usage
...
acc_log_request("Some comment");
...

1.4.2. 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.

   Example 22. acc_db_request usage
...
acc_log_request("Some comment", "Some table");
...

1.4.3. 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.

   Example 23. acc_rad_request usage
...
acc_rad_request("Some comment");
...

1.4.4. acc_diam_request(comment)

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

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

   Example 24. acc_diam_request usage
...
acc_diam_request("Some comment");
...