TSILO Module

Federico Cabiddu

   <federico.cabiddu@gmail.com>

Edited by

Federico Cabiddu

   <federico.cabiddu@gmail.com>

   Copyright © 2015 Federico Cabiddu
     __________________________________________________________________

   Table of Contents

   1. Admin Guide

        1. Overview
        2. Dependencies

              2.1. Kamailio modules
              2.2. External libraries or applications

        3. Parameters

              3.1. hash_size (integer)

        4. Functions

              4.1. ts_store()
              4.2. ts_append(domain, ruri)
              4.3. ts_append_to(tindex, tlabel, domain)

        5. Exported RPC Functions

              5.1. ts.dump
              5.2. ts.lookup

   List of Examples

   1.1. Set hash_size parameter
   1.2. ts_store usage
   1.3. ts_append usage
   1.4. ts_append_to usage

Chapter 1. Admin Guide

   Table of Contents

   1. Overview
   2. Dependencies

        2.1. Kamailio modules
        2.2. External libraries or applications

   3. Parameters

        3.1. hash_size (integer)

   4. Functions

        4.1. ts_store()
        4.2. ts_append(domain, ruri)
        4.3. ts_append_to(tindex, tlabel, domain)

   5. Exported RPC Functions

        5.1. ts.dump
        5.2. ts.lookup

1. Overview

   This module provides transaction storage for the Kamailio SIP Server
   Platform. It stores in an internal table transactions for a Request-URI
   (R-URI) and add branches to them later if new contacts for the AOR are
   added.

   When the ts_store function is called, the module stores the current
   transaction R-URI URI, index and label. Two functions (ts_append and
   ts_append_to) provide the ability to add new branches either to a
   specific transaction or to all of the transactions stored for a given
   R-URI. If USRLOC's use_domain option is true, the domain part of the
   R-URI is used to store the transaction, otherwise only the username
   part is used.

   When a transaction is destroyed by the TM module, it is removed from
   the module's table too.

2. Dependencies

   2.1. Kamailio modules
   2.2. External libraries or applications

2.1. Kamailio modules

   The following modules must be loaded before this module:
     * REGISTRAR--registrar module-- used to lookup for new contacts and
       update the dset for the r-uri.
     * TM--transaction module-- used to send SIP requests.
     * USRLOC--usrloc module-- according to the value of use_domain
       option, domain part of the r-uri will be used to store the
       transaction.
     * SL

2.2. External libraries or applications

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

3. Parameters

   3.1. hash_size (integer)

3.1. hash_size (integer)

   The size of the hash table internally used to keep the transaction. A
   larger table is much faster but consumes more memory. The hash size
   must be a power of two, otherwise it will be rounded down to the
   nearest power of two.

   Default value is “2048”.

   Example 1.1. Set hash_size parameter
...
modparam("tsilo", "hash_size", 1024)
...

4. Functions

   4.1. ts_store()
   4.2. ts_append(domain, ruri)
   4.3. ts_append_to(tindex, tlabel, domain)

4.1. ts_store()

   The method stores r-uri, tindex and tlabel of the current transaction.

   This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.

   Example 1.2. ts_store usage
...
if (is_method("INVITE")) {
        if (t_newtran()) {
                ts_store();
        }
}
...

4.2. ts_append(domain, ruri)

   The method add branches to all the stored transactions for the SIP ruri
   passed as parameter, performing a contact lookup on the table specified
   by the domain parameter. The method should be called when a REGISTER
   request is received.

   Meaning of the parameters is as follows:
     * domain - Name of table that should be used for looking up new
       contacts for r-uri.
     * ruri - The r-uri for which we want to check existing transactions
       and add them new branches. Can be a static string value or a
       dynamic string with pseudo-variables.

   This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.

   Example 1.3. ts_append usage
...
if (is_method("REGISTER")) {
        ts_append("location", "$tU");
}
...

4.3. ts_append_to(tindex, tlabel, domain)

   The method add branches to the transaction identified by tindex and
   tlabel, performing a contacts lookup on the table specified by the
   domain parameter. The method should be called when a REGISTER request
   is received.

   Meaning of the parameters is as follows:
     * tindex - internal index of transaction. Can be an integer or a
       pseudo-variable.
     * tlabel - internal label of transaction. Can be an integer or a
       pseudo-variable.
     * domain - Name of table that should be used for looking up new
       contacts for r-uri.

   This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.

   Example 1.4. ts_append_to usage
...
if (is_method("REGISTER")) {
        $var(tindex) = ...
        $var(tlabel) = ...
        ts_append_to("$var(tindex)", "$var(tlabel", "location");
}
...

5. Exported RPC Functions

   5.1. ts.dump
   5.2. ts.lookup

5.1. ts.dump

   Dumps the content of the TSILO table

   Name: ts.dump

   RPC Command Format:
                        kamcmd ts.dump

5.2. ts.lookup

   Dumps the transactions stored for the given RURI

   Name: ts.lookup

   RPC Command Format:
                        kamcmd ts.lookup sip:abcd@example.com
