ALIAS_DB Module

Daniel-Constantin Mierla

   <miconda@gmail.com>

Elena-Ramona Modroiu

   <ramona@asipto.com>

Edited by

Daniel-Constantin Mierla

   <miconda@gmail.com>

   Copyright © 2005 voice-system.ro

   Copyright © 2008 asipto.com
     __________________________________________________________

   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 (str)
              1.3.2. user_column (str)
              1.3.3. domain_column (str)
              1.3.4. alias_user_column (str)
              1.3.5. alias_domain_column (str)
              1.3.6. use_domain (int)
              1.3.7. domain_prefix (str)
              1.3.8. append_branches (int)

        1.4. Exported Functions

              1.4.1. alias_db_lookup(table_name)

   List of Examples

   1.1. Set db_url parameter
   1.2. Set user_column parameter
   1.3. Set domain_column parameter
   1.4. Set alias_user_column parameter
   1.5. Set alias_domain_column parameter
   1.6. Set use_domain parameter
   1.7. Set domain_prefix parameter
   1.8. Set append_branches parameter
   1.9. alias_db_lookup() usage

Chapter 1. Admin Guide

1.1. Overview

   ALIAS_DB module can be used as an alternative for user aliases
   via usrloc. The main feature is that it does not store all
   addiacent data as for user location and always uses database
   for search (no memory caching).

   Having no memory caching the speed of search can decrease but
   the provisioning is easier. With very fast databases like MySQL
   the speed penalty can be lowered. Also, the search can be
   performed on different tables in the same script.

1.2. Dependencies

1.2.1. Kamailio Modules

   The following modules must be loaded before this module:
     * database module (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 (str)

   Database URL.

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

   Example 1.1. Set db_url parameter
...
modparam("alias_db", "db_url", "dbdriver://username:password@dbhost/dbna
me")
...

1.3.2. user_column (str)

   Name of the column storing username.

   Default value is "username".

   Example 1.2. Set user_column parameter
...
modparam("alias_db", "user_column", "susername")
...

1.3.3. domain_column (str)

   Name of the column storing user's domain.

   Default value is "domain".

   Example 1.3. Set domain_column parameter
...
modparam("alias_db", "domain_column", "sdomain")
...

1.3.4. alias_user_column (str)

   Name of the column storing alias username.

   Default value is "alias_username".

   Example 1.4. Set alias_user_column parameter
...
modparam("alias_db", "alias_user_column", "auser")
...

1.3.5. alias_domain_column (str)

   Name of the column storing alias domain.

   Default value is "alias_domain".

   Example 1.5. Set alias_domain_column parameter
...
modparam("alias_db", "alias_domain_column", "adomain")
...

1.3.6. use_domain (int)

   Specifies whether to use or not the domain from R-URI when
   searching for alias. If set to 0, the domain from R-URI is not
   used, if set to 1 the domain from R-URI is used.

   Default value is "0".

   Example 1.6. Set use_domain parameter
...
modparam("alias_db", "use_domain", 1)
...

1.3.7. domain_prefix (str)

   Specifies the prefix to be stripped from the domain in R-URI
   before doing the search.

   Default value is "NULL".

   Example 1.7. Set domain_prefix parameter
...
modparam("alias_db", "domain_prefix", "sip.")
...

1.3.8. append_branches (int)

   If the alias resolves to many SIP IDs, the first is replacing
   the R-URI, the rest are added as branches.

   Default value is "0" (0 - don't add branches; 1 - add
   branches).

   Example 1.8. Set append_branches parameter
...
modparam("alias_db", "append_branches", 1)
...

1.4. Exported Functions

1.4.1.  alias_db_lookup(table_name)

   The function takes the R-URI and search to see whether it is an
   alias or not. If it is an alias for a local user, the R-URI is
   replaced with user's SIP uri.

   The function returns TRUE if R-URI is alias and it was replaced
   by user's SIP uri.

   Meaning of the parameters is as follows:
     * table_name - the name of the table where to search for
       alias. It can include pseudo-variables.

   This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.

   Example 1.9. alias_db_lookup() usage
...
alias_db_lookup("dbaliases");
alias_db_lookup("dba_$(rU{s.substr,0,1})");
...
