dialplan Module

Andreea-Ancuta Onofrei

   Voice Sistem SRL

Edited by

Andreea-Ancuta Onofrei

Edited by

Juha Heinanen

   Copyright © 2007-2008 Voice Sistem SRL

   Copyright © 2008-2010 Juha Heinanen
     __________________________________________________________________

   Table of Contents

   1. Admin Guide

        1. Overview
        2. How it works
        3. Usage cases
        4. Dependencies

              4.1. Kamailio Modules
              4.2. External Libraries or Applications

        5. Parameters

              5.1. db_url (string)
              5.2. table_name (string)
              5.3. dpid_col (string)
              5.4. pr_col (string)
              5.5. match_op_col (string)
              5.6. match_exp_col (string)
              5.7. match_len_col (string)
              5.8. subst_exp_col (string)
              5.9. repl_exp_col (string)
              5.10. attrs_col (string)
              5.11. attrs_pvar (string)
              5.12. fetch_rows (int)

        6. Functions

              6.1. dp_translate(id, [src[/dest]])

        7. MI Commands

              7.1. dp_reload
              7.2. dp_translate

        8. Exported RPC Commands

              8.1. dialplan.reload
              8.2. dialplan.translate

        9. Installation

   2. Developer's Guide

   List of Examples

   1.1. Set db_url parameter
   1.2. Set table_name parameter
   1.3. Set dpid_col parameter
   1.4. Set pr_col parameter
   1.5. Set match_op_col parameter
   1.6. Set match_exp_col parameter
   1.7. Set pr_col parameter
   1.8. Set pr_col parameter
   1.9. Set repl_exp_col parameter
   1.10. Set attrs_col parameter
   1.11. Set attrs_pvar parameter
   1.12. Set fetch_rows parameter
   1.13. dp_translate usage
   1.14. dp_translate usage
   1.15. Example of rules

Chapter 1. Admin Guide

   Table of Contents

   1. Overview
   2. How it works
   3. Usage cases
   4. Dependencies

        4.1. Kamailio Modules
        4.2. External Libraries or Applications

   5. Parameters

        5.1. db_url (string)
        5.2. table_name (string)
        5.3. dpid_col (string)
        5.4. pr_col (string)
        5.5. match_op_col (string)
        5.6. match_exp_col (string)
        5.7. match_len_col (string)
        5.8. subst_exp_col (string)
        5.9. repl_exp_col (string)
        5.10. attrs_col (string)
        5.11. attrs_pvar (string)
        5.12. fetch_rows (int)

   6. Functions

        6.1. dp_translate(id, [src[/dest]])

   7. MI Commands

        7.1. dp_reload
        7.2. dp_translate

   8. Exported RPC Commands

        8.1. dialplan.reload
        8.2. dialplan.translate

   9. Installation

1. Overview

   This module implements generic string translations based on matching
   and replacement rules. It can be used to manipulate Request URI or a PV
   and to translated to a new format/value.

2. How it works

   At startup, the module will load a set of transformation rules from a
   database. Every database row will be stored in memory as a translation
   rule. Each rule will describe how the matching should be made, how the
   input value should be modified and which attributes should be set for
   the matching transformation.

   The module expects an input value which will be matched against a rule
   by using regular expressions (see 'man pcresyntax' for syntax), string
   or fnmatch (see 'man fnmatch') matching. Overlapping matching
   expressions can be controlled via priorities. Once a rule is matched,
   the defined transformation (if any) is applied and the result is
   returned as output value. Also, if any string attribute is associated
   to the rule, this will be returned to the script along with the output
   value.

   The first matching rule will be processed.

3. Usage cases

   The module can be used to implement dialplans - do to auto completion
   of the dial numbers (like national to international), to convert
   generic numbers to specific numbers (like for emergency numbers).

   The module can also be used for detecting range or sets of numbers
   mapped on a service/case - attribute string can be used here to store
   extra information about the service/case.

   Non-SIP string translation can be implemented - like converting country
   names from all possible formats to a canonical format: (UK, England,
   United Kingdom) -> GB.

   Any other string-base translation or detection for whatever other
   purposes.

4. Dependencies

   4.1. Kamailio Modules
   4.2. External Libraries or Applications

4.1. Kamailio Modules

   The following modules must be loaded before this module:
     * None

4.2. External Libraries or Applications

   The following libraries or applications must be installed before
   running Kamailio with this module loaded:
     * libpcre - the libraries of PCRE.

5. Parameters

   5.1. db_url (string)
   5.2. table_name (string)
   5.3. dpid_col (string)
   5.4. pr_col (string)
   5.5. match_op_col (string)
   5.6. match_exp_col (string)
   5.7. match_len_col (string)
   5.8. subst_exp_col (string)
   5.9. repl_exp_col (string)
   5.10. attrs_col (string)
   5.11. attrs_pvar (string)
   5.12. fetch_rows (int)

5.1. db_url (string)

   The translation rules will be loaded using this database URL.

   Default value is “mysql://openser:openserrw@localhost/openser”.

   Example 1.1. Set db_url parameter
...
modparam("dialplan", "db_url", "mysql://user:passwb@localhost/db")
...

5.2. table_name (string)

   The table's name from which to load the translation rules.

   Default value is “dialplan”.

   Example 1.2. Set table_name parameter
...
modparam("dialplan", "table_name", "my_table")
...

5.3. dpid_col (string)

   The column name used to store the dialplan ID group.

   Default value is “dpid”.

   Example 1.3. Set dpid_col parameter
...
modparam("dialplan", "dpid_col", "column_name")
...

5.4. pr_col (string)

   The column name used to store the priority of the corresponding rule
   from the database row.

   Default value is “pr”.

   Example 1.4. Set pr_col parameter
...
modparam("dialplan", "pr_col", "column_name")
...

5.5. match_op_col (string)

   The column name used to store the type of matching of the rule.

   Default value is “match_op”.

   Example 1.5. Set match_op_col parameter
...
modparam("dialplan", "match_op_col", "column_name")
...

5.6. match_exp_col (string)

   The column name to store the rule match expression.

   Default value is “match_exp”.

   Example 1.6. Set match_exp_col parameter
...
modparam("dialplan", "match_exp_col", "column_name")
...

5.7. match_len_col (string)

   The column name to store the length of a string matching the match
   expression.

   Default value is “match_len”.

   Example 1.7. Set pr_col parameter
...
modparam("dialplan", "match_len_col", "column_name")
...

5.8. subst_exp_col (string)

   The column name to store the rule's substitution expression.

   Default value is “subst_exp”.

   Example 1.8. Set pr_col parameter
...
modparam("dialplan", "subst_exp_col", "column_name")
...

5.9. repl_exp_col (string)

   The column name to store the rule's replacement expression.

   Default value is “repl_exp”.

   Example 1.9. Set repl_exp_col parameter
...
modparam("dialplan", "repl_exp_col", "column_name")
...

5.10. attrs_col (string)

   The column name to store the rule's attributes to be set to the
   message.

   Default value is “attrs”.

   Example 1.10. Set attrs_col parameter
...
modparam("dialplan", "attrs_col", "column_name")
...

5.11. attrs_pvar (string)

   The pvar to store the rule's attributes, after translation
   (dp_translate() succeeds). This parameter can be an AVP or a SCRIPT
   VAR.

   Default value is “NULL”.

   Example 1.11. Set attrs_pvar parameter
...
modparam("dialplan", "attrs_pvar", "$avp(s:dest)")
...

5.12. fetch_rows (int)

   The number of rows to be fetched at once from database

   Default value is “1000”.

   Example 1.12. Set fetch_rows parameter
...
modparam("dialplan", "fetch_rows", 4000)
...

6. Functions

   6.1. dp_translate(id, [src[/dest]])

6.1.  dp_translate(id, [src[/dest]])

   Will try to translate src into dest according to the translation rules
   with dialplan ID equal to id. If src/dest is missing the default
   parameter “ruri.user/ruri.user” will be used, thus translating the
   request uri user part. If only dest is missing, only matching and
   storing of matching rule's attributes is done.

   Returns 1, if translation succeeded, -1 in case of some error occurred,
   and -2 if dialplan with ID equal to id does not exist.

   Meaning of the parameters is as follows:
     * id -the dialplan id of the possible matching rules. This parameter
       can have the following types:
          + integer- the dialplan id is statically assigned
          + avp var - the dialplan id is the value of an existing avp
            variable
          + script var - the dialplan id is the value of an existing
            script variable.
     * src/dest - input and output of the function.
       Input parameter src can be any pseudo variable. Output parameter
       dest can be:
          + R-URI
            - the string is the r-uri or r-uri user part
          + avp var
            - At input the function will get the input string from an
            existing avp variable. At output the function will add an avp
            with the value of the output string.
          + script var
            - At input the function will get the input string from an
            existing script variable. At output the function will set an
            script variable with the value of the output string.

   This function can be used from ANY_ROUTE.

   Example 1.13. dp_translate usage
...
dp_translate("240", "$ruri.user/$avp(s:dest)");
xlog("translated to var $avp(s:dest) \n");
...

   Example 1.14. dp_translate usage
...
$avp(s:src) = $ruri.user;
dp_translate("$var(x)", "$avp(s:src)/$var(y)");
xlog("translated to var $var(y) \n");
...

7. MI Commands

   7.1. dp_reload
   7.2. dp_translate

7.1. dp_reload

   Forces an update of the translation rules from the database.

   Name: dp_reload

   Parameters: none

   MI DATAGRAM Command Format:
                :dp_reload:
                _empty_line_

7.2. dp_translate

   Will apply a translation rule identified by a dialplan id and an input
   string.

   Name: dp_translate

   Parameters: 2
     * Dial plan ID
     * Input String

   MI DATAGRAM Command Format:
            :dp_translate:
            dpid
            input
                _empty_line_

8. Exported RPC Commands

   8.1. dialplan.reload
   8.2. dialplan.translate

8.1. dialplan.reload

   Forces an update of the translation rules from the database.

   Name: dialplan.reload

   Parameters: none

   Example:
                sercmd dialplan.reload

8.2. dialplan.translate

   Will apply a translation rule identified by a dialplan id and an input
   string.

   Name: dialplan.translate

   Parameters: 2
     * Dial plan ID
     * Input String

   Example:
        # sercmd dp_translate dpid "input"
        sercmd dp_translate 1 "abcdxyz"

9. Installation

   The modules requires one table in Kamailio database: dialplan. The SQL
   syntax to create them can be found in dialplan-create.sql script in the
   database directories in the kamailio/scripts folder. You can also find
   the complete database documentation on the project webpage,
   http://www.kamailio.org/docs/db-tables/kamailio-db-devel.html.

   Some sample records fromd dialplan table are presented in the next
   figure.

   Example 1.15. Example of rules
...
dpid: 1
pr: 1
match_op: 1
match_exp: ^0([1-9][0-9]+)$
match_len: 0
subst_exp: ^0([1-9][0-9]+)$
repl_exp: 0049\1
attrs: xyz
...
dpid: 1
pr: 1
match_op: 1
match_exp: ^0([1-9][0-9]+)$
match_len: 0
subst_exp: ^0(.+)$
repl_exp: $var(prefix)\1
attrs: xyz
...

   Note that you can use config variables in the replacement expression
   (repl_exp) field. However, not all of config variables are safe to use
   there - specifically the variables that have in their name other
   variables (variables with dinamic name). References to sip message,
   private variables ($var(...)) and AVPs with static name are among those
   that are safe to use in replacement expressions.

   The match_op field specify matching operator, valid value being: 0 -
   string comparison; 1 - regular expression matching (pcre); 2 - fnmatch
   (shell-like pattern) matching.

Chapter 2. Developer's Guide

   The module does not provide any API to use in other Kamailio modules.
