IMS Usrloc PCSCF Module

Jason Penton

   Smile Communications

Edited by

Richard Good

   Smile Communications

   Copyright © 2012 Smile Communications
     __________________________________________________________________

   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 (int)
              3.2. timer_interval (int)

        4. Functions

              4.1.

        5. RPC Commands

              5.1. ulpcscf.status

        6. Statistics

              6.1. registered contacts
              6.2. impus
              6.3. expired contacts

   2. Frequently Asked Questions

   List of Examples

   1.1. Set hash_size parameter
   1.2. Set timer_interval parameter

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 (int)
        3.2. timer_interval (int)

   4. Functions

        4.1.

   5. RPC Commands

        5.1. ulpcscf.status

   6. Statistics

        6.1. registered contacts
        6.2. impus
        6.3. expired contacts

1. Overview

   This module serves as a storage engine for PCSCF contacts, much like
   the standard Kamailio module, usrloc, is a storage engine for standard
   SIP contacts. The concept of a contact in IMS, PCSCF specifically, is
   very different to that of std. SIP and as a result we have built this
   new module. Alot of the design has been borrowed from the std. usrloc
   module. For example. An IMS contact, in PCSCF, needs things like:
     * Diameter Rx session for signalling bearer status. i.e. this is
       effectively QoS from the network to make sure the signalling link
       can be 'trusted'
     * IPSEC Security Assocation for secure signalling between UE and
       PCSCF (first point of contact)
     * IMPU, each contact can have a number of associated public
       identities (IMPU).

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:
     * None.

2.2. External Libraries or Applications

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

3. Parameters

   3.1. hash_size (int)
   3.2. timer_interval (int)

3.1. hash_size (int)

   The number of entries of the hash table used by to store the contact
   records is 2^hash_size. For hash_size=4, the number of entries of the
   hash table is 16.

   Default value is 9.

   Example 1.1. Set hash_size parameter
...
modparam("ims_usrloc_pcscf", "hash_size", 10)
...

3.2. timer_interval (int)

   Number of seconds between two timer runs. The module uses timer to
   delete expired contacts.

   Default value is 60.

   Example 1.2. Set timer_interval parameter
...
modparam("ims_usrloc_pcscf", "timer_interval", 30)
...

4. Functions

   4.1.

   There are no exported functions that could be used in scripts.

5. RPC Commands

   5.1. ulpcscf.status

   exported RPC commands.

5.1. ulpcscf.status

   Status of pcscf_usrloc, AORs, max slots, etc.

6. Statistics

   6.1. registered contacts
   6.2. impus
   6.3. expired contacts

   Exported statistics are listed in the next sections.

6.1. registered contacts

   Number of AOR contacts in registered state - cannot be reset.

6.2. impus

   Number of IMPUs - cannot be reset.

6.3. expired contacts

   Number of expired contacts - can be reset.

Chapter 2. Frequently Asked Questions

   2.1. Where can I find more about Kamailio?
   2.2. Where can I post a question about this module?
   2.3. How can I report a bug?

   2.1.

       Where can I find more about Kamailio?

       Take a look at http://www.kamailio.org/.

   2.2.

       Where can I post a question about this module?

       First at all check if your question was already answered on one of our
       mailing lists:
         * User Mailing List -
           http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
         * Developer Mailing List -
           http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev

       E-mails regarding any stable Kamailio release should be sent to
       <sr-users@lists.sip-router.org> and e-mails regarding development
       versions should be sent to <sr-dev@lists.sip-router.org>.

       If you want to keep the mail private, send it to
       <sr-users@lists.sip-router.org>.

   2.3.

       How can I report a bug?

       Please follow the guidelines provided at:
       http://sip-router.org/tracker.
