SIP Express Media Server

What is Sems ?

Sems is a free and extensible media server which helps you adding voice services to your VoIP system. Together with Ser (SIP Express Router), it turns every Linux box into a full-featured IP telephony system.

Sems can be extended through plug-ins. They help you support more voice codecs or new applications. The plug-in Sdk is included for programmers who wish to create their own plug-ins.

The following plug-ins are shipped with Sems:

Voicemail: record messages and mail them.
ISDN Gateway: support calls from and to the PSTN.
Conferencing: connect people within a conference room.
Announcement: plays an announcement.
Echo: test module echoing your voice.

The following audio codecs are shipped with Sems:

G711.u
G711.a
GSM 06.10
iLBC (development version)
speex (development version)

Special features:

MP3 file writer: attachments to voicemails with mp3 compressions.
Text-to-speech: allows you to provide the user with dynamically generated messages.
Interactive voice response (IVR): support for automatic voice based services created with simple scripts in python or perl.

New Sems version:

The last version presented here is 0.9.0. It is also pretty old (>1 year). A new version has been written, including an almost complete re-organisation of the code. This version will be, as soon as really stable, the new official version. A special home page has been made for this version at www.iptel.org/drupal/sems.

As the old 0.9.0 version will be discontinued, i invite everybody interested in Sems to test the new one to make it the best Sems release ever.

Where to get Sems from ?

Sems is available from CVS server at berlios.de using one of the following commands. Alternatively you can download a snapshot by clicking one of the links, please do a

cvs update

after extracting the source tree.

sems development version:

cvs -d:pserver:anonymous@cvs.berlios.de:/cvsroot/sems co answer_machine 
snapshot
05/19/05

sems version 0.9.0:

cvs -d:pserver:anonymous@cvs.berlios.de:/cvsroot/sems co -rser_rel_0_9_0 answer_machine 

snapshot
05/19/05

sems version 0.8.12:

cvs -d:pserver:anonymous@cvs.berlios.de:/cvsroot/sems co -rser_rel_0_8_12 answer_machine 

snapshot 
05/19/05

Note: ser rel. 0.8.12 and ser rel. 0.8.14 will run with sems version 0.8.12, while later versions of ser run with the development version / 0.9.0 of sems (recommended).

Licence

Sems is distributed under GNU General Public License (GPL).

Where to get information, give feedback or report some bug ?

See the readme file, the installation howto in the docs/ directory. There is some ppt-slides (pdf) of a presentation about sems. If you have further questions please drop a mail at sems@iptel.org (please subscribe first). The mailing list archives of the sems mailing list is a good resource, too.

Authors

Raphael Coeffic (rco@iptel.org)
Stefan Sayer (sayer@fokus.fraunhofer.de)
Ullrich Abend (ullstar@iptel.org)