Presence User Agent for XMPP (Presence gateway between SIP and XMPP)

Anca-Maria Vamanu

   Voice Sistem SRL

Edited by

Anca-Maria Vamanu

   Copyright © 2007 Voice Sistem SRL
     __________________________________________________________________

   Table of Contents

   1. Admin Guide

        1. Overview
        2. Dependencies

              2.1. Kamailio Modules
              2.2. External Libraries or Applications

        3. Parameters

              3.1. server_address(str)

        4. Functions

              4.1. pua_xmpp_notify()
              4.2. pua_xmpp_req_winfo(request_uri, expires)

        5. Filtering

   2. Developer Guide

   List of Examples

   1.1. Set server_address parameter
   1.2. pua_xmpp_notify usage
   1.3. xmpp_send_winfo 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. server_address(str)

   4. Functions

        4.1. pua_xmpp_notify()
        4.2. pua_xmpp_req_winfo(request_uri, expires)

   5. Filtering

1. Overview

   This module is a gateway for presence between SIP and XMPP.

   It translates one format into another and uses xmpp, pua and presence
   modules to manage the transmission of presence state information.

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:
     * presence.
     * pua.
     * xmpp.

2.2. External Libraries or Applications

   The following libraries or applications must be installed before
   running Kamailio with this module loaded:
     * libxml.

3. Parameters

   3.1. server_address(str)

3.1. server_address(str)

   The SIP URI specifying the address of the SIP server.

   Example 1.1. Set server_address parameter
...
modparam("pua_xmpp", "server_address", "sip:160.23.23.10")
...

4. Functions

   4.1. pua_xmpp_notify()
   4.2. pua_xmpp_req_winfo(request_uri, expires)

   Functions exported to be used in configuration file.

4.1.  pua_xmpp_notify()

   Function that handles Notify messages addressed to a user from an xmpp
   domain. It requires filtering after method and domain in configuration
   file. If the function is successful, a 2xx reply must be sent.

   This function can be used from REQUEST_ROUTE.

   Example 1.2. pua_xmpp_notify usage
...
        if( is_method("NOTIFY") && uri=~"sip:.+@sip-xmpp.kamailio.org")
        {
                if(pua_xmpp_notify())
                        t_reply("200", "OK");
                exit;
        }
...

4.2.  pua_xmpp_req_winfo(request_uri, expires)

   Function called when a Subscribe addressed to a user from an xmpp
   domain is received. It calls sending a Subscribe for winfo for the
   user, and the following Notify with dialog-info is translated into a
   subscription in xmpp. It also requires filtering in configuration file,
   after method, domain and event(only for presence).

   It takes 2 parameters: request_uri and the value of Expires header
   field in received Subscribe.

   This function can be used from REQUEST_ROUTE.

   Example 1.3. xmpp_send_winfo usage
...
        if( is_method("SUBSCRIBE"))
        {
                handle_subscribe();
                if(uri=~"sip:.+@sip-xmpp.siphub.ro" && $hdr(Event)== "presence")
                {
                        pua_xmpp_req_winfo("$ruri", "$hdr(Expires)");
                }
                t_release();
        }

...

5.  Filtering

   Instead of "sip-xmpp.siphub.ro" in the example you should use the value
   set for the xmpp module parameter named 'gateway_domain'.

Chapter 2. Developer Guide

   The module provides no function to be used in other Kamailio modules.
