name mode size
apps 040000
cmake 040000
core 040000
doc 040000
pkg 040000
.gitignore 100644 77B
CMakeLists.txt 100644 10.99kB
Makefile 100644 1.57kB
Makefile.defs 100644 8.89kB
README 100644 12.77kB
sems.h.cmake 100644 2.73kB
+------------------------------------+ | SIP Express Media Server - README | +------------------------------------+ 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. 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 only supports patent free codecs. That means that codecs like g729 won't be supported. On the other hand, SEMS supports all important patent free codecs out of the box (g711u, g711a, GSM06.10, speex, G726, L16 and iLBC). 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. 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 : * announcement plays an announcement * voicemail records voice messages and sends them as email, saves them to a voicebox, or both * 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 * echo test module to echo the caller's voice * 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) * 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 * auth_b2b B2BUA app that changes identity and authenticates second call leg * 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 * 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 * sw_prepaid_sip prepaid application * call_timer B2BUA, ends the call after a certain time * precoded_announce plays preencoded announcements 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. 1. Python version >= 2.3 for the ivr (embedded python interpreter) and py_sems, optional 2. flite speech synthesizer for TTS in the ivr, optional 3. lame >= 3.95 for mp3 file output, optional. mpg123 for mp3 playback, optional 4. xmlrpcpp for XMLRPC control, optional 5. spandsp library for DTMF detection and PLC, optional (SEMS has its own implementations for both) 6. libZRTP SDK ( for ZRTP, optional 7. libev for jsonrpc, optional How to get started with SEMS: To try out SEMS, the easiest is to get a release from, 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. On debian, you can add the SEMS repository to /etc/apt/sources.list: deb lenny free deb-src lenny free and install SEMS from binary packages with: $ apt-get install sems sems-python-modules If you want to build SEMS from source on debian, see below. On Fedora, 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. Application Modules Documentation page then gives an overview of the application modules that come with SEMS ( If you are interested in writing your own applications, the application development tutorial is a good start (, together with the design overview ( and the example applications (apps/examples/). Installation: 1. Download SEMS Download the source tarball from, or get the newest version through svn: $ svn checkout svn:// -or- $ svn checkout 2. Compile SEMS $ make all $ make install Notice: you don't need to execute 'make install' if you want to run SEMS from the source tree, but in this case some paths in the config files will need to be adapted. If you want to install to a different prefix than /usr/local, use PREFIX=/some/other/prefix For detailed instructions for some modules, have a look at doc/COMPILING as well. 3. Look at the default configuration file whether it fits your need: If you installed SEMS with 'make install', the configuration is at '/usr/local/etc/sems/sems.conf'. Else make your own using sems.conf.sample. 4. Start SEMS: If you installed SEMS with 'make install', sems can be found at '/usr/local/sbin/sems'. If you need help starting 'sems', try 'sems -h'. 5. Using SEMS 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. Alternatively, the SIP-stack-SER can be configured in ser-sems.cfg to send all calls directly to one application, in that case the line if(!t_write_unix("/tmp/sems_sock","sems/app_headers")) in ser-sems.cfg could be changed to e.g. if(!t_write_unix("/tmp/sems_sock","conference")) A sample ser.cfg file in this style can be found at Creating packages on debian (ubuntu, ...): install debian package build tools: $ apt-get install debhelper devscripts install dependencies: $ apt-get install g++ make libspandsp-dev flite-dev libspeex-dev \ libssl-dev python-dev python-sip4-dev openssl get the source: $ wget ; tar xzvf sems-x.y.z.tar.gz $ cd sems-x.y.z ; ln -s pkg/debian . set version in changelog if not correct $ dch -v x.y.z "SEMS x.y.z release" build package: $ dpkg-buildpackage -rfakeroot -us -uc install package 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: Support, mailing lists, bugs and contact: Please have a look at the documentation and other information on the SEMS homepage ( Best-effort support is given through the mailing lists for SEMS, and, 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: The mailing list archives at and can be a great help as well (especially with google site search on, e.g. ). The bug tracker for SEMS is at Please submit all bugs, crashes and feature requests you encounter. Authors: Raphael Coeffic (, the father of SEMS, Stefan Sayer (, current lead developer, and all contributors: Alex Gradinar Alfred E Heggestad Andreas Granig Andrey Samusenko Andriy I Pylypenko B. Oldenburg Balint Kovacs Bogdan Pintea Greger Viken Teigre Grzegorz Stanislawski Helmut Kuper Jeremy A Jiri Kuthan Juha Heinanen Ovidiu Sas Peter Lemenkov Peter Loeppky Richard Newman Robert Szokovacs Rui Jin Zheng Tom van der Geer Ulrich Abend (if you want to be added or removed from this list, please mail to Special thanks to IPTEGO GmbH and iptelorg GmbH 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.