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           | SIP Express Media Server  - README |

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 Introduction:
 

  SEMS is a free, high performance, extensible media server 
  for SIP (RFC3261) based VoIP services. 
 
  It is intended to complement proxy/registrar servers
  in VoIP networks for all applications where server-
  side processing of audio is required, for example away 
  or pre-call announcements, voicemail, or network side 

  conferencing. Another use case is for interconnecting
  SIP networks, where a back-to-back user agent (B2BUA)
  is required.

 
  SEMS can be used to implement simple high performance 
  components like announcement servers as building 
  blocks of more complex applications, or, using its powerful 
  framework for application development including back-to-back 

  user agent (B2BUA) and state machine scripting functionality, 
  complex VoIP services can be realized completely in SEMS. 

  SEMS supports all important patent free codecs out of the
  box (g711u, g711a, GSM06.10, speex, G.726, L16 and iLBC).
  There is a wrapper for the IPP G.729 codec implementation
  available. Integrating other codecs in SEMS is very simple
  (patented or not).

 
  SEMS shows very good performance on current standard
  PC architecture based server systems. It has sucessfully
  been run with 1200 G.711 conference channels on a quad-core
  Intel(R) Xeon at 2GHz (700 GSM, 280 iLBC channels), and up to 

  5000 channels on a dual quad Xeon at 2.9GHz. Its back-to-back
  user agent has been run with up to 19000 TPS on the latter
  machine. On the other hand it also runs on very small devices -
  for example small embedded systems like routers running OpenWRT,
  for which of course the achievable channel count is not that
  high.

 
 License:
 
  SEMS is free (speech+beer) software. It is licensed under dual 

  license terms, the GPL (v2+) and proprietary license. This
  program is released under the GPL with the additional exemption
  that compiling, linking, and/or using OpenSSL is allowed.

 
  See doc/COPYING for details.
 
 Applications:

  The following applications are shipped with SEMS :

  Announcements (Prompts, Ringbacktones, Pre-call-prompts):

   * announcement   plays an announcement

   * ann_b2b        pre-call-announcement, plays announcement 
                    before connecting the callee in B2BUA mode
  
   * announce_transfer  pre-call-announcement, plays announcement 
                    and then transfers the caller to the callee 
                    using REFER

   * early_announce (pre-call) announcement using early media (183),
                    optionally continues the call in B2BUA mode

   * precoded_announce plays preencoded announcements
 
 
  Voicemail/Mailbox

   * voicebox       users can dial in to the voicebox to check

                    their messages

   * annrecorder    users can record their personal greeting 
                    message
 

   * mailbox        auto-attendant that saves voicemails into
                    an IMAP server. Users can dial in to check
                    their messages (simpler version)
 

   * voicemail      records voice messages and sends them 
                    as email, saves them to a voicebox, or
                    both

  Conferencing
 
   * conference     enables many people to talk together 
                    at the same time
 
   * webconference  conference application that can be 
                    controlled from an external program, 
                    e.g. a website 

 
   * conf_auth      collect a PIN number, verify it against an 

                    XMLRPC authentication server and connects in 
                    B2BUA mode

   * pin_collect    collect a PIN, optionally verify it, and transfer

                    the call into a conference

  Back-to-back User Agent
   
   * sbc            flexible SBC application, supports
                     - identity change
                     - header manipulation (filter etc)
                     - (multihomed) RTP relay
                     - SIP authentication 
                     - Session timer, call timer, prepaid
                     etc
  App development
 
   * dsm            DSM state machine scripting (use this)
 
   * ivr            embedded Python interpreter for simple apps
   
   * py_sems        another embedded Python interpreter
 
  Misc
   * echo           test module to echo the caller's voice
  
 

   * callback       reject the call, call back caller later and have 

                    her enter a number to call in b2bua with media relay
                    mode
 

   * reg_agent     SIP REGISTER to register SEMS' contact to an aor
 
 

 Developing and customizing Applications and services:
 
  SEMS comes with a set of example applications intended to help 

  development of custom services, including a calling card 
  application, a traffic generator, a component to control the 

  media server via XMLRPC, and announcements played from DB.
 
  DSM state machine scripting is a powerful yet simple method
  to rapidly implement custom applications. With this method,
  the service logic is written as an easy to understand 
  textual definition of a state machine, which is interpreted
  and executed for every call. The (domain specific) language 
  for defining state machines can be extended by implementing
  modules. A set of useful modules are shipped with SEMS, 
  including MySQL database access module, Python module, 
  conference support, Amazon AWS and more. 

  SEMS' core implements basic call and audio processing, 
  and loads plug-ins which extend the system. Audio
  plug-ins enable new codecs and file formats, 
  application plug-ins implement the services' logic.
  Other modules called component modules provide 
  functionality for other modules to use.
 
  You can easily extend SEMS by creating your own plug-ins.
  Applications can be written using the SEMS framework API 
  in C++, or in Python using an embedded python interpreter 

  of the ivr or py_sems modules, or the DSM.

 Requirements:
 

  All requirements are optional.
 

  o Python version >= 2.3 for the ivr (embedded python interpreter)
     and py_sems
  o flite speech synthesizer for TTS in the ivr
  o lame >= 3.95 for mp3 file output, mpg123 for mp3 playback
  o spandsp library for DTMF detection and PLC

     (SEMS has its own implementations for both)

  o libZRTP SDK (http://zfoneproject.com) for ZRTP
  o libev for jsonrpc

 How to get started with SEMS:

   To try out SEMS, the easiest is to get a release from 
   http://ftp.iptel.org/pub/sems/, unpack and install it 

   using the usual make && make install. After installation, the 
   configuration file /usr/local/etc/sems/sems.conf needs to be 

   adapted, especially the parameters "sip_ip", "media_ip",
   "load_plugins", "application".

   On Debian and Ubuntu, add the SEMS repository from OBS to 

   /etc/apt/sources.list:

      deb http://download.opensuse.org/repositories/home:/team-sems/Debian_5.0 ./
   and install SEMS packages with: 
    wget http://download.opensuse.org/repositories/home:/team-sems/Debian_5.0/Release.key \
         -O - |apt-key add -   
    apt-get update && apt-get install sems
   If you want to build SEMS from source on debian/derivatives, see below.
 
   On Fedora/CentOS, simply do 

    $ sudo yum install sems
   and sems package will be installed.

   You can also follow one of the tutorials linked from the SEMS homepage
   (e.g. http://ftp.iptel.org/pub/sems/doc/current/howtostart_noproxy.html).
   The Application Modules Documentation page then gives an 
   overview of the application modules that come with SEMS 

   (http://ftp.iptel.org/pub/sems/doc/current/AppDoc.html).
   

   If you are interested in writing your own applications, the 
   application development tutorial is a good start 
   (http://www.iptel.org/sems/sems_application_development_tutorial),

   together with the design overview 

   (http://www.iptel.org/files/semsng-designoverview.pdf) and the example
   applications (apps/examples/).

   SEMS needs to be told from the many possible applications that are
   loaded which one to run. You can simply set the application 
   in sems.conf, e.g. application=conference. You can also define an
   application mapping, i.e. numbers (R-URIs) that will be mapped to
   applications, see the explanation of 'application' parameter in 
   sems.conf.

 Creating packages on debian (ubuntu, ...), here for wheezy:

 
    install debian package build tools:

    $ sudo apt-get install debhelper devscripts

 
    install dependencies:

    $  sudo apt-get install g++ make libspandsp-dev flite-dev libspeex-dev \

          libssl-dev python-dev python-sip-dev openssl libev-dev \
          libmysql++-dev libevent-dev libxml2-dev libcurl4-openssl-dev

    
    get the source: 
    $ wget ftp.iptel.org/pub/sems/sems-x.y.z.tar.gz ; tar xzvf sems-x.y.z.tar.gz

    or, for git master:
    $ git clone git://git.sip-router.org/sems
 

    $ cd sems-x.y.z ; ln -s pkg/deb/debian .

 
    set version in changelog if not correct
    $ dch -v x.y.z "SEMS x.y.z release"

    or:
    $ dch -b -v `git describe --always` "sems git master"

    
    build package:
    $ dpkg-buildpackage -rfakeroot -us -uc
 

    install sems and sems-python-modules packages in .. using dpkg.

 Installed files using 'make install':

     /usr/local/sbin/sems                 : SEMS executable
     /usr/local/lib/sems/plug-in/*        : plug-ins
     /usr/local/lib/sems/audio/*          : default path for audio files

     /usr/local/lib/sems/ivr/*            : precompiled IVR scripts

     /usr/local/etc/sems/sems.conf        : configuration file
     /usr/local/etc/sems/etc/*            : modules configuration files

     /usr/local/share/doc/sems/README     : this README.
 
     source_path/scripts/sems[.redhat]    : example start-up scripts.
     source_path/sems.conf.example        : example configuration file.
 

 Documentation:
 

   In the doc/ directory there is a set of files describing the
   applications shipped with SEMS, alongside some more documentation.

   Generate the doxygen documentation with 'make doc' in doc/doxygen_doc,
   that contains all these files as well.

   All this and more documentation is available online linked from 
   the SEMS homepage: 
     http://www.iptel.org/sems.

 Support, mailing lists, bugs and contact:

   Please have a look at the documentation and other information on 
   the SEMS homepage (www.iptel.org/sems). 

   Best-effort support is given through the mailing lists for SEMS,
   sems@iptel.org and semsdev@iptel.org, which are the first address 
   to ask for help, report bugs and improvements. You need to be 
   subscribed to be able to post to the lists: http://lists.iptel.org.
   The mailing list archives at   http://lists.iptel.org/pipermail/sems/ 
   and http://lists.iptel.org/pipermail/semsdev/ can be a great help as
   well (especially with google site search on lists.iptel.org, e.g.
   http://www.google.com/coop/cse?cx=006590474108803368786%3A158hxzctv4u ). 
 
   The bug tracker for SEMS is at http://tracker.iptel.org/browse/SEMS
   Please submit all bugs, crashes and feature requests you encounter.

 Authors:

   Raphael Coeffic (rco@iptel.org), the father of SEMS, 

   Stefan Sayer (stefan.sayer@gmail.com), current lead developer,
   and all contributors:
     Alex Gradinar
     Alfred E Heggestad
     Andreas Granig
     Andrey Samusenko
     Andriy I Pylypenko

     Anton Zagorskiy

     B. Oldenburg
     Balint Kovacs
     Bogdan Pintea
     Greger Viken Teigre
     Grzegorz Stanislawski
     Helmut Kuper
     Jeremy A
     Jiri Kuthan
     Juha Heinanen

     Matthew Williams

     Ovidiu Sas
     Peter Lemenkov
     Peter Loeppky
     Richard Newman
     Robert Szokovacs
     Rui Jin Zheng
     Tom van der Geer
     Ulrich Abend

    (if you feel you should be on this list, please mail to stefan.sayer@gmail.com)

   Special thanks to IPTEGO GmbH, iptelorg GmbH and TelTech Systems Inc. for 
   sponsoring development of SEMS.

 Contributions:
 
   All kinds of contributions and bug fixes are very welcome, for 
   example new application or codec modules, documentation pages, howtos
   etc. Please email one of the lists or the authors.
 

   Please also have a look at the contributions license policy 
   (see doc/COPYING).
   
 SEMS - the media-S in the SLAMP.