# &adminguide;

## Overview

ACC module is used to account transactions information to different backends like syslog and SQL. With the separate module acc_radius support for radius is enabled.

There is some very early support of the Diameter protocol in the acc_diameter module, but is not up to date with the current Diameter protocols. If you need Diameter support, please use the ims_charging module.

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 acc.i.params). 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 writer 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 - acc.i.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.

- 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). However, CDR-based logging has the option to log existing information from expired dialogs (the dlg_vars in cdr_extra) Please see cdr_expired_dlg_enable parameter - acc.p.cdr_expired_dlg_enable.

The SQL backend support is compiled in the module.

### 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 */
    };

## Extra accounting

### 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).

### 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: https://www.kamailio.org/wikidocs/cookbooks/devel/pseudovariables

Note: For all the ACK processed by tm, the registered callbacks (like acc module) will be called with the corresponding INVITE transaction contexts as long as this is still available. This means that the ACK callbacks will see the AVPs setup for the INVITE transaction and not the AVPs setup before t_relay().

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.

### 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.

## Multi Call-Legs accounting

### 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 modifying the call destination-, and not A - as initiator of the call. Call forwarding on server is only one example which shows the necessity of having an accounting engine with multiple legs support.

### 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 strictly 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 by setting the per-leg set of AVPs via the `multi_leg_info` module parameter.

### 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.

  You will need to add in your DB (all acc related tables) the columns 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 that Radius support is in a separate module - acc_radius.

  You will need to add in your dictionary the RADIUS AVPs used in call-leg AVP set definition.

## Call Data Record generation

### Overview

In addition to transaction-based logging, it is possible to generate and log Call Data Records (CDRs) directly from &kamailio;. Apart from a basic set of CDR fields which are always included (covering start time, end time, and duration), the approach allows flexible specification of additional fields that should be taken into account using the configuration script. This is very similar to how transaction-based logging may be customized with the exception that CDRs rely on dialogs instead of transactions to store relevant information during a call.

In order to set up CDR generation, you must enable the CDR switch and load the dialog module. You probably also want to specify a set of pseudo-variables that define more relevant CDR fields. Pseudo-variables may be assigned arbitrarily during script execution, and the module will make sure that the variable content will be transformed into a CDR by the end of the dialog.

To use CDR logging in a correct manner, you should only use the dialog-based pseudo-variables (dlg_var) from the dialog module. This allows you to save values right from the beginning through all requests and replies until termination of the call. While not recommended, it is still possible to use other pseudo-variables as well. Except for pseudo-variables valid in the call-final transaction, however, information given will not be stored in the CDR as they cannot be accessed by the end of the call when the CDR is logged.

The dialog module needs to be engaged on the dialogs that should be accounted, that they will be tracked by the server. This is usally done by calling the function dlg_manage(). Refer to the documentation of the dialog module for more information.

Sometimes, dialogs expire because the UA has a problem and a final message is never transmitted. You can toggle on/off the generation of CDR-based logging in such cases with only the dlg_vars showing by using the cdr_expired_dlg_enable parameter - acc.p.cdr_expired_dlg_enable. Default behavior is not logging.

### CDR Extra

This section is similar to the LOG accounting part of acc.i.extra-accounting.

#### Definitions and syntax

Selection of extra information is done similar to the transaction extra acc-def-syn.

- cdr_extra = cdr_extra_definition (';'cdr_extra_definition)*

- cdr_extra_definition = cdr_log_name '=' pseudo_variable

See also acc.p.cdr_extra.

The list with all pseudo-variables in &kamailio; can be found at: &kamwikilink;.

### CDR with Multi Call-Legs

#### Overview

As mentioned in acc.i.multi-call-legs, a leg represents a parallel or forwarded call. In contrast to the normal accounting the cdr logging uses dialogs instead of transaction to log data. This may reduce the amount of information but it also make it possible to combine all important data in one cdr at once. A second mechanism to process multiple data-sets into one cdr is not further necessary.

#### Configuration

When you route messages multiple times through your proxy (e.g. to handle call-forwardings) you have to use detect_spirals from the dialog modules. Otherwise the proxy can't identify and reuse existing dialogs.

To get the correct call-forwarding-chain you have to store each cf* with the corresponding caller and callee in a dialog based pseudo-variable (dlg_var) (e.g. chain=B;cfa;C|C;cfnr;D). Additionally it is necessary to store the caller and callee for each leg. All this helps to identify the involved phone partners and forwarding chain. When you route such calls multiple times to the same Proxy, you could store the caller and callee within a transaction based avp and write it into the dialog based dlg_var pv during a 200 INVITE.

##### Example for a spiraled Proxy

    ...
    # A calls B (transaction 1)
    $avp(caller)='A'
    $avp(callee)='B';
    $dlg_var(chain)='';

    # B cfa C (transaction 2)
    $avp(caller)='B'
    $avp(callee)='C';
    $dlg_var(chain)='B;cfu;C';

    # C cfnr D (transaction 3)
    $avp(caller)='C'
    $avp(callee)='D';
    $dlg_var(chain)=$dlg_var(chain) + "|" + "C;cfnr;D";

    # C confirms call (200 reply of transaction 2)
    $dlg_var(caller) = $avp(caller); #caller='B'
    $dlg_var(callee) = $avp(callee); #callee='C'
    ...

#### Logged data

For each call, all dialog corresponding variables will be logged. After a call is finished, the generated call data record information will be logged as string (VAR1=xxx,VAR2=xxxx,...) to the syslog.

## Dependencies

### &kamailio; Modules

The module depends on the following modules (in 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.

- dialog -- Dialog, if cdr_enable module parameter is enabled.

### External Libraries or Applications

The following libraries or applications must be installed before running &kamailio; with this module loaded:

- None

## Parameters

### `early_media` (integer)

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

Default value is 0 (no).

#### early_media example

    ...
    modparam("acc", "early_media", 1)
    ...

### `failed_transaction_flag` (integer)

Per transaction flag which says if the transaction should be accounted also in case of failure (SIP status code >= 300). This flag triggers accounting when the whole transaction fails (on the server side).

Default value is not-set (no flag).

#### failed_transaction_flag example

    ...
    modparam("acc", "failed_transaction_flag", 4)
    ...

### `failed_filter` (string)

A string of failure response codes from 300 to 999 separated by commas. Failed transaction will not be accounted if its response code is in the list even when failed_transaction_flag is set.

Default value is not-set (failure filtering is off).

#### failed_filter example

    ...
    modparam("acc", "failed_filter", "404,407")
    ...

### `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). The flag for accounting has to be set for each ACK as well.

Default value is 0 (no).

#### report_ack example

    ...
    modparam("acc", "report_ack", 1)
    ...

### `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).

#### report_cancels example

    ...
    modparam("acc", "report_cancels", 1)
    ...

### `detect_direction` (integer)

Controls 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).

#### detect_direction example

    ...
    modparam("acc", "detect_direction", 1)
    ...

### `acc_prepare_flag` (integer)

Per transaction flag which says if the transaction may be accounted later, with flags set in TM module specific routes (e.g., like failure_route). If this flag is not set and acc or missed_call flag are not set either in request route block, there is no way to mark the request for transaction later unless you set acc_prepare_always. If either acc or missed_call flags are set in request route block, there is no need to set this flag.

Default value is not-set (no flag).

#### acc_prepare_flag example

    ...
    modparam("acc", "acc_prepare_flag", 5)
    ...

### `acc_prepare_always` (integer)

Prepare all request even if acc_prepare_flag is not set to mark the request for transaction later.

Default value is not-set (previous behaviour).

#### acc_prepare_flag example

    ...
    modparam("acc", "acc_prepare_always", 1)
    ...

### `acc_extra_nullable` (integer)

If set to 1, the database acc extra fields are set to NULL if the corresponding script variable is not defined or has $null value. If set to 0, the value is saved as empty string (the existing behavior).

Database columns may need to be altered to DROP NOT NULL constraints and DROP DEFAULT values in order to accept NULL values.

Default value is 0.

#### acc_extra_nullable example

    ...
    modparam("acc", "acc_extra_nullable", 1)
    ...

### `multi_leg_info` (string)

Defines the AVP set to be used in per-call-leg accounting. See acc.i.multi-call-legs 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).

#### 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 DIAMETER-based accounting, use the DIAMETER AVP ID (as integer)
    modparam("acc", "multi_leg_info",
        "2345=$avp(src);2346=$avp(dst)")
    ...

### `log_flag` (integer)

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

Default value is not-set (no flag).

#### log_flag example

    ...
    modparam("acc", "log_flag", 2)
    ...

### `log_missed_flag` (integer)

Request flag which needs to be set to account missed calls via syslog. This can be used to e.g. account failures during the call setup phase from the callee (client) side, for example if you do forking to several destinations.

Keep in mind that this flag is reset after branch completion. Therefore it is necessary to set it again e.g. in a failure_route if you do serial forking and want to log all attempts.

Default value is not-set (no flag).

#### log_missed_flag example

    ...
    modparam("acc", "log_missed_flag", 3)
    ...

### `log_level` (integer)

Log level at which accounting messages are issued to syslog.

Default value is 1 (L_NOTICE).

#### log_level example

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

### `log_facility` (string)

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

Default value is LOG_DAEMON.

#### log_facility example

    ...
    modparam("acc", "log_facility", "LOG_DAEMON")
    ...

### `log_extra` (string)

Extra values to be logged. See section acc.i.extra-accounting for more details.

Default value is NULL.

#### log_extra example

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

### `db_flag` (integer)

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

Default value is not-set (no flag).

#### db_flag example

    ...
    modparam("acc", "db_flag", 2)
    ...

### `db_missed_flag` (integer)

Request flag which needs to be set to account missed calls via database. This can be used to e.g. account failures during the call setup phase from the callee (client) side, for example if you do forking to several destinations.

Keep in mind that this flag is reset after branch completion. Therefore it is necessary to set it again e.g. in a failure_route if you do serial forking and want to log all attempts.

Default value is not-set (no flag).

#### db_missed_flag example

    ...
    modparam("acc", "db_missed_flag", 3)
    ...

### `db_table_acc` (string)

Table name of accounting successful calls -- database specific. It can contain config variables that will be evaluated at runtime.

Default value is acc

#### db_table_acc example

    ...
    modparam("acc", "db_table_acc", "myacc_table")
    modparam("acc", "db_table_acc", "acc_$time(year)_$time(mon)")
    ...

### `db_table_missed_calls` (string)

Table name for accounting missed calls -- database specific. It can contain config variables that will be evaluated at runtime.

Default value is missed_calls

#### db_table_missed_calls example

    ...
    modparam("acc", "db_table_missed_calls", "myMC_table")
    ...

### `db_url` (string)

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

Default value is NULL (SQL disabled).

#### db_url example

    ...
    modparam("acc", "db_url", "mysql://user:password@localhost/kamailio")
    ...

### `db_version_check` (integer)

Whether to validate database schema versions when the module initializes or not.

Default value is 1 (perform version checks).

#### db_version_check example

    ...
    modparam("acc", "db_version_check", 0)
    ...

### `acc_method_column` (string)

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

Default value is method.

#### acc_method_column example

    ...
    modparam("acc", "acc_method_column", "method")
    ...

### `acc_from_tag_column` (string)

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

Default value is from_tag.

#### acc_from_tag_column example

    ...
    modparam("acc", "acc_from_tag_column", "from_tag")
    ...

### `acc_to_tag_column` (string)

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

Default value is to_tag.

#### acc_to_tag_column example

    ...
    modparam("acc", "acc_to_tag_column", "to_tag")
    ...

### `acc_callid_column` (string)

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

Default value is callid.

#### acc_callid_column example

    ...
    modparam("acc", "acc_callid_column", "callid")
    ...

### `acc_sip_code_column` (string)

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

Default value is sip_code.

#### acc_sip_code_column example

    ...
    modparam("acc", "acc_sip_code_column", "sip_code")
    ...

### `acc_sip_reason_column` (string)

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

Default value is sip_reason.

#### acc_sip_reason_column example

    ...
    modparam("acc", "acc_sip_reason_column", "sip_reason")
    ...

### `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.

#### acc_time_column example

    ...
    modparam("acc", "acc_time_column", "time")
    ...

### `db_extra` (string)

Extra values to be logged into database - DB specific. See section acc.i.extra-accounting for more details.

Default value is NULL.

#### db_extra example

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

### `db_insert_mode` (integer)

If set to 1, use INSERT DELAYED to add records to accounting tables when the DB driver has support for it. If no INSERT DELAYED support is offered by DB driver, then standard INSERT is used. Beware that MySQL InnoDB engine doesn't support INSERT DELAYED, thus be sure the acc tables are defined with different type (e.g., MyISAM).

If set to 2, async insert is used if the db driver module has support for it and if async_workers core parameter value is greater than 0. If not, then standard INSERT is used.

Default value is 0 (no INSERT DELAYED nor async insert).

#### db_insert_mode example

    ...
    modparam("acc", "db_insert_mode", 1)
    ...

### `cdr_enable` (integer)

Enable CDR reporting - one record per call reported to "acc_cdrs" table, relying on dialog module.

The value can be:

- 0 - off (default).

- 1 - on.

#### cdr_enable example

    ...
    modparam("acc", "cdr_enable", 1)
    ...

### `cdr_skip` (string)

Skip cdr generation for dialogs with this dlg_var set.

Default value is NULL.

#### cdr_skip example

    ...
    modparam("acc", "cdr_skip", "nocdr")
    ...

### `cdr_expired_dlg_enable` (integer)

Should CDR-based logging be enabled in case of expired dialogs?

- 0 - off (default).

- 1 - on.

#### cdr_expired_dlg_enable example

    ...
    modparam("acc", "cdr_expired_dlg_enable", 1)
    ...

### `cdr_start_on_confirmed` (integer)

Should the start time be taken from the time when the dialog is created, or when the dialog is confirmed?

- 0 - use time of dialog creation (default).

- 1 - use time of dialog confirmation.

#### cdr_start_on_confirmed example

    ...
    modparam("acc", "cdr_start_on_confirmed", 1)
    ...

### `cdr_facility` (integer)

Log facility to which CDR messages are issued to syslog. This allows to easily separate CDR-specific logging from the other log messages.

Default value is LOG_DAEMON.

#### cdr_facility example

    ...
    modparam("acc", "cdr_facility", "LOG_DAEMON")
    ...

### `cdr_extra` (string)

Set of pseudo-variables defining custom CDR fields. See acc.i.cdr-extra for more details.

Default value is NULL.

#### cdr_extra example

    ...
    modparam("acc", "cdr_extra", "c1=$dlg_var(caller);c2=$dlg_var(callee)")
    ...

### `cdr_extra_nullable` (integer)

Should custom CDR fields be saved as NULL?

If set to 0, custom CDR fields not defined in config operation (or set to $null) will be saved as empty string. If set to 1, custom CDR fields not defined in config operation (or set to $null) will be saved as NULL.

Database columns may need to be altered to DROP NOT NULL constraints and DROP DEFAULT values in order to accept NULL values.

Default value is 0.

#### cdr_extra_nullable example

    ...
    modparam("acc", "cdr_extra_nullable", 1)
    ...

### `cdr_start_id` (string)

Modifying the id which is used to store the start time.

Default value is 'start_time'

#### cdr_start_id example

    ...
    modparam("acc", "cdr_start_id", "start")
    ...

### `cdr_end_id` (string)

Modifying the id which is used to store the end time.

Default value is 'end_time'

#### cdr_end_id example

    ...
    modparam("acc", "cdr_end_id", "end")
    ...

### `cdr_duration_id` (string)

Modify the id which is used to store the duration.

Default value is 'duration'

#### cdr_duration_id example

    ...
    modparam("acc", "cdr_duration_id", "d")
    ...

### `cdr_duration_mode` (integer)

Modify the precision of the duration stored for the call.

Values can be:

- 0 - save the cdr duration as seconds.

- 1 - (default), save the cdr duration as seconds.milliseconds.

- 2 - save the cdr duration as seconds.microseconds.

#### cdr_duration_mode example

    ...
    modparam("acc", "cdr_duration_mode", 2)
    ...

### `cdr_log_enable` (int)

Control if CDR-based accounting should be written to syslog.

0 - off. 1 - on (default).

#### cdr_log_enable example

    ...
    modparam("acc", "cdr_log_enable", 0)
    ...

### `cdrs_table` (str)

Name of db table to store dialog-based CDRs.

Default value is "" (no db storage for dialog-based CDRs).

#### cdrs_table example

    ...
    modparam("acc", "cdrs_table", "acc_cdrs")
    ...

### `time_mode` (int)

Store additional value related to the time of event.

Values can be:

- 0 - (default), save only unix timestamp for syslog and datetime for database.

- 1 - save seconds in time_attr and microseconds in time_exten.

- 2 - save seconds.milliseconds in time_attr.

- 3 - save formatted time according to time_format parameter, using the output of localtime(). Used for cdr entries too.

- 4 - save formatted time according to time_format parameter, using the output of gmtime(). Used for cdr entries too.

#### time_mode example

    ...
    modparam("acc", "time_mode", 1)
    ...

### `time_attr` (str)

Name of the syslog attribute or database column where to store additional value related to the time of event.

For db accounting, the column has to be of different types, depending on time_mode value. When time_mode is:

- 1 - time_attr column has to be int.

- 2 - time_attr column has to be double.

- 3 - time_attr column has to be varchar(128).

- 4 - time_attr column has to be varchar(128).

For time_mode=1, this attribute is not written in syslog, because time value is already unix timestamp, but in db accounting time value is datetime and requires a function to get the timestamp.

#### time_attr example

    ...
    modparam("acc", "time_attr", "seconds")
    ...

### `time_exten` (str)

Name of the syslog attribute or database column where to store extended value related to the time of event.

It is used now only for time_mode=1 and database column has to be int:

#### time_exten example

    ...
    modparam("acc", "time_exten", "microsecs")
    ...

### `time_format` (str)

Specify the format to print the time for time_mode 3 or 4.

Default value is %Y-%m-%d %H:%M:%S".

#### time_format example

    ...
    modparam("acc", "time_format", "%Y/%m/%d %H:%M:%S")
    ...

### `reason_from_hf` (int)

Tells where to take sip_reason from. If value is 0, sip_reason is taken from status line. Otherwise, sip_reason is taken from Reason header field(s) if present. Currently only the first Reason header is used.

Default value is 0.

#### reason_from_hf

    ...
    modparam("acc", "reason_from_hf", 1)
    ...

### `clone_msg` (int)

If set to 1, request structure from transaction is cloned temporarily in the callback to get acc attributes. It is required if you account values from SIP headers to avoid concurrent access to the shared memory transaction structure, specially when accounting 1xx events. If set to 0, it uses directly the shared memory structure, be sure you store all needed attributes in AVPs/XAVPs inside request route.

Default value is 1.

#### clone_msg

    ...
    modparam("acc", "clone_msg", 0)
    ...

### `cdr_on_failed` (int)

If set to 1, the module stores the CDR for a failed dialog (calls not answered). If set to 0, those records are not stored, only those for answered calls.

Default value is 1.

#### cdr_on_failed

    ...
    modparam("acc", "cdr_on_failed", 0)
    ...

### `acc_extra_size` (int)

Set the maximum number of extra attributes that can be stored in the accounting record (event accounting record). It is related to log_extra and db_extra module parameters.

Default value is 64.

#### acc_extra_size

    ...
    modparam("acc", "acc_extra_size", 100)
    ...

### `cdr_extra_size` (int)

Set the maximum number of extra attributes that can be stored in the call data record (cdr by dialog module). It is related to cdr_extra module parameter.

Default value is 64.

#### cdr_extra_size

    ...
    modparam("acc", "cdr_extra_size", 100)
    ...

## Functions

### `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. The string can contain any number of pseudo-variables.

This function can be used from ANY_ROUTE.

#### acc_log_request usage

    ...
    acc_log_request("Some comment");
    $var(code) = 404;
    $avp(reason) = "Not found";
    acc_log_request("$var(code) Error: $avp(reason)");
    ...

### `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. The string can contain any number of pseudo-variables.

- table - Database table to be used. It can contain config variables that are evaluated at runtime.

This function can be used from ANY_ROUTE.

#### acc_db_request usage

    ...
    acc_db_request("Some comment", "SomeTable");
    acc_db_request("Some comment", "acc_$time(year)_$time(mon)");
    acc_db_request("$var(code) Error: $avp(reason)", "SomeTable");
    ...

### `acc_request(comment, table)`

Wrapper around `acc_log_request` and `acc_db_request` functions, writing the accounting record to LOG and DATABASE backends. If db_url parameter is not set, the acc record is written only to LOG backend.

Meaning of the parameters is as follows:

- comment - Comment to be used for generating the SIP response code and text fields, if in the format CODE TEXT. The CODE should be a valid SIP response code (100..699). The TEXT can be one or many words. If CODE is missing, then 0 is used. The parameter can contain pseudo-variables.

- table - Database table to be used. It can contain config variables that are evaluated at runtime.

This function can be used from ANY_ROUTE.

#### acc_db_request usage

    ...
    acc_request("100 Received", "acc");
    acc_request("100 Received", "acc_$time(year)_$time(mon)");
    acc_db_request("$var(code) $avp(reason)", "acc");
    ...