--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/intercom/README	Fri Jun 25 09:57:52 2010 +0200
@@ -0,0 +1,72 @@
+README version 22jun2005
+
+Welcome to intercom, a Voice over IP speaker-phone conference 
+application. The application can:
+- dial a intercom partner via short-dial buttons
+- make a RTP connection to transport your voice over IPv4
+- make a telephone conference
+- support wideband codec (16kHz sample frequency)
+
+Intercom is still very limited. But the things it can do, it does
+very well!
+
+
+Modify file ~/.intercom.conf for your short-dial labels
+and your IP-addresses.
+
+To start the application enter
+
+  intercom
+  
+Read shell script /usr/local/bin/intercom to get an idea of what is 
+going on. For better echo cancellation start intercom with the -m or
+-l option.
+
+For a first test talk to yourself by clicking the button for your own
+IP-address, e.g. EDDF TEC2 if your computer is 192.168.1.2.
+The button should become green.
+Attention: A short click (less then 300ms) toggles on/off, a long
+click works as push-to-talk.
+
+ATTENTION: The intercom application needs PCM out for playback. This
+hardware device is used also by other sound programs like MP3 players 
+(e.g. xmms) or WAV record/playback programs like sweep and audacity. The
+intercom application blocks (freezes) as long as another program uses 
+PCM out. There are ways around this like using sound daemons aRTs or 
+esound. But this is outside of the intercom application.
+
+If you dial another intercom station, you get an one-way connection from
+your microphone to the loudspeaker of your intercom partner. If your 
+partner clicks on the correct button (the magenta one), both of you have 
+a two-way communication. Now you or your partner can dial more intercom
+stations to make a conference with maximum 6 stations.
+Note: Start intercom with the -t option to get "everybody can talk and 
+listen with everybody else".
+
+
+Read the file 
+http://home.arcor.de/andreadrian/intercom/draft-conference-01.txt 
+for more information.
+
+
+Supported royalty free Codecs:
+For License see ITU-T G.191 or IETF RFC3951
+
+Narrowband (8kHz sample frequency):
+-----------------------------------
+IETF iLBC           15.2kBit/s  Global IP Sound iLBC Public License
+ITU-T G.711 A-law   64kBit/s    ITU-T SOFTWARE TOOLS' GENERAL PUBLIC LICENSE
+ITU-T G.711 u-law   64kBit/s    ITU-T SOFTWARE TOOLS' GENERAL PUBLIC LICENSE
+ITU-T G.726 32kbs   32kBit/s    ITU-T SOFTWARE TOOLS' GENERAL PUBLIC LICENSE
+3GPP GSM            13.2kBit/s  ITU-T SOFTWARE TOOLS' GENERAL PUBLIC LICENSE
+
+Wideband (16kHz sample frequency):
+----------------------------------
+Speex               27.8kBit/s  Xiph.org license (BSD license variant)
+
+Author: Andre Adrian
+E-Mail: Andre dot Adrian at dfs dot de
+Postal: DFS Tower Frankfurt
+        Mr. Andre Adrian
+        Flughafen Gebaeude 501
+        60549 Frankfurt, Germany