pdt Module

Elena-Ramona Modroiu

   asipto.com
   <ramona@asipto.com>

Edited by

Elena-Ramona Modroiu

   <ramona@asipto.com>

   Copyright © 2003 FhG FOKUS

   Copyright © 2004 voice-system.ro

   Copyright © 2008 Elena-Ramona Modroiu
     __________________________________________________________

   Table of Contents

   1. Admin Guide

        1.1. Overview
        1.2. Dependencies

              1.2.1. Kamailio Modules
              1.2.2. External Libraries or Applications

        1.3. Exported Parameters

              1.3.1. db_url (string)
              1.3.2. db_table (string)
              1.3.3. sdomain_column (string)
              1.3.4. prefix_column (string)
              1.3.5. domain_column (string)
              1.3.6. prefix (string)
              1.3.7. fetch_rows (integer)
              1.3.8. char_list (string)
              1.3.9. check_domain (integer)

        1.4. Exported Functions

              1.4.1. prefix2domain(rewrite_mode, multidomain_mode)

              1.4.2. prefix2domain(rewrite_mode)
              1.4.3. prefix2domain()

        1.5. Exported MI Functions

              1.5.1. pdt_add
              1.5.2. pdt_delete
              1.5.3. pdt_list
              1.5.4. pdt_reload

        1.6. Installation and Running

   List of Examples

   1.1. prefix-domain translation
   1.2. Set db_url parameter
   1.3. Set db_table parameter
   1.4. Set sdomain_column parameter
   1.5. Set prefix_column parameter
   1.6. Set domain_column parameter
   1.7. Set prefix parameter
   1.8. Set fetch_rows parameter
   1.9. Set char_list parameter
   1.10. Set check_domain parameter
   1.11. prefix2domain usage

Chapter 1. Admin Guide

1.1. Overview

   This module translates a numerical prefix into a domain and
   updates accordingly the request URI.

   The module looks up at the R-URI part of a message and if the
   user part begins with an established prefix it will update the
   URI. Updating the uri consists of: remove the prefix from the
   user part of the uri and keep the rest as the user part of the
   new uri. The host and port are changed with the domain matched
   for the leading prefix and the domain in From URI.

   <prefix><userid><:password>@<mydomain.com> ...

   and the result will be:

   <userid><:password>@<domain[:port]>...

   Example 1.1. prefix-domain translation
prefix=123, domain(FROM)=siphub.org

entry in database:
 sdomain=siphub.org
    domain[123]=alpha.org
    domain[124]=beta.org
    domain[125]=gamma.org

The RURI will be updated in the following way"
sip:12391001@mydomain.com  => sip:91001@alpha.org

   The prefix could be prefixed by other digits. These digits will
   not be used to look up the domain (the classic example, 00 used
   for international calls, then follows the country prefix). For
   more information on this, see 'prefix' parameter.
     * A sample config file is located in './doc/'.
     * MySQL script to create the database needed by PDT is
       located in '../../scripts/mysql/pdt-create.sql'
       The database is loaded by Kamailio only at start up time
       and only cache is used to lookup domains. Check the MI
       Functions for adding/deleting prefix-domain pairs or
       reloading from database at runtime.
     * Sample shell scripts to manage prefix-domain pairs are also
       located in './doc/' (pdt_fifo_add.sh, pdt_fifo_delete.sh,
       pdt_fifo_list.sh).

1.2. Dependencies

1.2.1. Kamailio Modules

   The following modules must be loaded before this module:
     * A Kamailio database module (e.g., mysql, dbtext).

1.2.2. External Libraries or Applications

   The following libraries or applications must be installed
   before running Kamailio with this module loaded:
     * None.

1.3. Exported Parameters

1.3.1. db_url (string)

   URL of the database table to be used.

   Default value is "mysql://openser:openserrw@localhost/openser".

   Example 1.2. Set db_url parameter
...
modparam("pdt", "db_url", "dbdriver://username:password@dbhost/dbname")
...

1.3.2. db_table (string)

   Table name.

   Default value is "pdt".

   Example 1.3. Set db_table parameter
...
modparam("pdt", "db_table", "pdt")
...

1.3.3. sdomain_column (string)

   Name of 'sdomain' column.

   Default value is "sdomain".

   Example 1.4. Set sdomain_column parameter
...
modparam("pdt", "domain_column", "source_domain")
...

1.3.4. prefix_column (string)

   Name of 'prefix' column.

   Default value is "prefix".

   Example 1.5. Set prefix_column parameter
...
modparam("pdt", "prefix_column", "prefix")
...

1.3.5. domain_column (string)

   Name of 'domain' column.

   Default value is "domain".

   Example 1.6. Set domain_column parameter
...
modparam("pdt", "domain_column", "hostname")
...

1.3.6. prefix (string)

   Default leading prefix who denotes what URI needs to be
   translated - if it is NULL the module will not check the R-URI
   against it and the PDT prefix is considered starting from the
   first digit. Otherwise, the module will check first if the
   R-URI starts with it and will skip it to look up the domain.

   Default value is NULL.

   Example 1.7. Set prefix parameter
...
modparam("pdt", "prefix", "00")
...

1.3.7. fetch_rows (integer)

   Number of rows to be loaded in one step from database.

   Default value is 1000.

   Example 1.8. Set fetch_rows parameter
...
modparam("pdt", "fetch_rows", 4000)
...

1.3.8. char_list (string)

   The list with characters allowed in prefix.

   Default value is "0123456789".

   Example 1.9. Set char_list parameter
...
modparam("pdt", "char_list", "0123456789*+")
...

1.3.9. check_domain (integer)

   Module will check if destination domain is duplicated for same
   source domain (1 - check; 0 - don't check).

   Default value is 1.

   Example 1.10. Set check_domain parameter
...
modparam("pdt", "check_domain", 0)
...

1.4. Exported Functions

1.4.1.  prefix2domain(rewrite_mode, multidomain_mode)

   Build a new URI if it is necessary. Returns 1 when the
   translation was made or there was nothing to translate (user
   part of the URI is empty, it does not match the prefix
   parameter or there is no domain associated with a possible
   prefix from user part). Returns -1 in error cases.

   The translation is done based on lookup up for a entry in the
   database where the sdomain equals the domain in FROM uri, and
   the prefix matches the beginning of the user part of the RURI.
   If such an entry is found, then the domain in RURI is updated
   with the domain of this entry (sdomain, prefix, domain).

   There is also the possibility to have the translation of URI
   regardless of source domain. This can be achieved inserting in
   the database entries where sdomain has the value "*".

   The "rewrite_mode" parameter specifies whether to strip or not
   the prefix from user part. The possible values are:
     * 0: the prefix is removed along with the leading prefix.
     * 1: only the leading prefix is removed.
     * 2: the user part of the URI is not changed.
     * $PV : any PV holding one of the above values.

   The "multidomain_mode" parameter specifies the kind of
   multidomain support to use. The possible values are:
     * 0 : Translation of URI regardless of source domain.
     * 1 : Translation of URI using as source domain the domain in
       From-URI.
     * 2 : Translation of URI using as source domain the domain in
       From-URI. In case there is no entry for the required
       sdomain, it tries the translation using "*" as sdomain.
     * $PV : any PV holding one of the above values.

   This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.

   Example 1.11. prefix2domain usage
...
prefix2domain("2", "2");
...
$var(a) = 1;
prefix2domain("$var(a)", "2");
...

1.4.2.  prefix2domain(rewrite_mode)

   The same as prefix2domain(rewrite_mode, "0"), that is without
   multidomain support, translation of URI being done regardless
   of the source domain.
...
prefix2domain("2");
...

1.4.3.  prefix2domain()

   The same as prefix2domain("0", "0").
...
prefix2domain();
...

1.5. Exported MI Functions

   The database is loaded by Kamailio at start up time. The module
   uses only the cache to look up domains. If you want to add or
   delete a new prefix-domain pair at runtime you have to use MI
   FIFO commands. All changes made via these commands are applied
   to database and the cache is updated correspondingly.

1.5.1.  pdt_add

   Adds a new sdomain-prefix-domain entry.

   Name: pdt_add

   Parameters:
     * _sdomain_ : source domain
     * _prefix_: prefix
     * _domain_: domain corresponding to a pair of source domain
       and prefix

   MI FIFO Command Format:
                :pdt_add:_reply_fifo_file_
                _sdomain_
                _prefix_
                _domain_
                _empty_line_

1.5.2.  pdt_delete

   Removes a sdomain-prefix-domain entry.

   Name: pdt_delete

   Parameters:
     * _sdomain_ : a source domain
     * _domain_: a domain associated via a prefix with the source
       domain

   MI FIFO Command Format:
                :pdt_delete:_reply_fifo_file_
                _sdomain_
                _domain_
                _empty_line_

1.5.3.  pdt_list

   Produces a listing of the entries prefixes/domains/sdomains.

   Name: pdt_list

   Parameters:
     * _sdomain_ : a source domain value.
     * _prefix_ : a prefix value
     * _domain_: a domain value

   "." (dot) means NULL value

   The comparison operation is 'START WITH' -- if domain is 'a'
   then all domains starting with 'a' are listed.

   MI FIFO Command Format:
                :pdt_list:_reply_fifo_file_
                _sdomain_
                _prefix_
                _domain_
                _empty_line_

   Examples:
     * "pdt_list siph 2 ." : Lists the entries where sdomain is
       starting with 'siph', prefix is starting with '2' and
       domain is anything
     * "pdt_list siph 2" : Lists the entries where sdomain is
       starting with 'siph', prefix is starting with '2' and
       domain is anything
     * "pdt_list . 2 open" : Lists the entries where sdomain is
       anything, prefix starts with '2' and domain starts with
       'open'.

1.5.4.  pdt_reload

   Reload all sdomain-prefix-domain records from database.

   Name: pdt_reload

   Parameters:
     * none

   MI FIFO Command Format:
                :pdt_reload:_reply_fifo_file_
                _empty_line_

1.6. Installation and Running

   Example shell scripts for MI FIFO commands are placed in
   './doc/' (pdt_fifo_add.sh, pdt_fifo_delete.sh,
   pdt_fifo_list.sh).
