[svlug] Voice over IP (VoIP) and Linux Telephony

[Greg Herlein]

> i am searching for an application in LINUX, which will receive my voice and
> send them in packets to the other LINUX box
> i want it to be smiple application using UDP

The OpenH323 Project
http://www.openh323.org/
far from simple, but ohphone is the best developed app so far 

Linphone
http://simon.morlat.free.fr/
have not used it but it's come a long way fast

OSIP - Open SIP Stack Library
http://osip.atosc.org/
finally, and open SIP stack in C!

VOCAL - The Vovida Open Communication Application Lib
http://www.vovida.org/
Open source stacks in C++, but rather big and resource hungry

Asterisk - Open Source PBX
http://www.asteriskpbx.org/
Extensive development effort

Bayonne - the GNU Project IVR Software
http://www.gnu.org/software/bayonne/bayonne.html
Been around a long time, widest range of card support

PreViking - Telephony Middleware
http://www.bellworldwide.net/previking/
Excellent framework for building telephony services.

Also, you may be intersted in the Linux Telphony API
(LTAPI).  This API was originally designed for low density linux
telephony applications and is in the kernel now (GPL).  To date,
only Quicknet card drivers are supported, but I am developing a
driver for Voicetronix cards now and there is at least one other
new telephony card with drivers under development.

And, there's an open hardware voice T1 card available with a PRI
library even.  See:

http://www.zapatatelephony.org
and
http://www.zapatatelephony.org/libpri/ 


A new discussion list has started to look at getting a
consistent linux telephony API that works across all these
cards.  The current LTAPI is geared towards low density devices,
but may need modification if high density (T1 and up) supprt is
to work.  You cna join this list by sending email to 

	majordomo at lists.herlein.com

with the line "subscribe ltapi <your address>" in the message
body.

We're trying to get an informal BoF together for linux telphony
enthusiasts at the LinuxWorld in San Francisco this
month.  Details on that to follow, since there is no more space
for an official Bof at the conference.

I also have an SDP and an RTP library under development, but my
development time has been rather reduced lately.  

Greg