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https://github.com/sems-server/sems

Sip Express Media Server
https://github.com/sems-server/sems

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Sip Express Media Server

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README 

        

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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, OPUS, iLBC etc).

 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.



 For a license to use SEMS under non-GPL terms, please contact

 FRAFOS GmbH at [email protected] .

 

 See doc/COPYING for details.



Applications:



 The following applications are shipped with SEMS :



  Back-to-back User Agent

  

  * sbc            flexible SBC application, supports

                    - identity change

                    - header manipulation (filter etc)

                    - (multihomed) RTP relay, NAT handling, transcoding

                    - SIP authentication 

                    - Session timer, call timer, prepaid

                    etc



 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



 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



Creating packages on debian (ubuntu, ...):



   install debian package build tools:

   $ sudo apt-get install debhelper devscripts



   install dependencies (those below or let dpkg-buildpackage below tell you

   which ones):

   $ sudo apt-get install debhelper g++ make libspandsp-dev flite1-dev \

         libspeex-dev libgsm1-dev libopus-dev libssl-dev python-dev \

	 python-sip-dev openssl libev-dev libmysqlcppconn-dev libevent-dev \

	 libxml2-dev libcurl4-openssl-dev libhiredis-dev

   

   get the source: 

   $ git clone https://github.com/sems-server/sems.git



   $ cd sems; ln -s pkg/deb/buster ./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.



Support, mailing lists, bugs and contact:



  Best-effort support is given through the mailing lists for SEMS,

  [email protected] and [email protected], which are the

  first address to ask for help, report bugs and improvements.



  Bugs can be filed as issues on this site.  Please submit all bugs,

  crashes and feature requests you encounter.



Authors:



  Raphael Coeffic ([email protected]), the father of SEMS, 

  Stefan Sayer ([email protected]), 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

    Carsten Bock

    Greger Viken Teigre

    Grzegorz Stanislawski

    Helmut Kuper

    Jeremy A

    Jiri Kuthan

    Joe Stusick

    Jose-Luis Millan

    Juha Heinanen

    Matthew Williams

    Michael Furmur

    Ovidiu Sas

    Pavel Kasparek

    Peter Lemenkov

    Peter Loeppky

    Richard Newman

    Robert Szokovacs

    Rui Jin Zheng

    Tom van der Geer

    Ulrich Abend

    Vaclav Kubart

    Victor Seva

   (if you feel you should be on this list, please mail to [email protected])

 

  Special thanks to FRAFOS GmbH, sipwise GmbH, 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.