How to make video chat application smarter ?

Hi all,
   I am implementing a video chat application which is working fine in high bandwith, but it is not working well on lower bandwith (200Kbps - 500Kbps). Please help me to over come the above constraint. Please find the video resolution details as below:
     1) Video resolution : 640 x 480 (24fps , KeyFrame interval 15) -- publishing
     2) Video resolution : 320 x 240 (24fps , KeyFrame interval 15) -- Playback
The above two are freezed. The following are the required to achieve
   1) If bandwidht is low show an alert to the user
   2) Detect speakers are not connected to the machine
   3) Detect download / Upload speed of network
Please help me to achieve the above.
Thanks in advance.

If you're sending keyframe intervals at every 3 frames (unless you meant seconds?) you're using way too much bandwidth. Nobody can really tell you the "perfect" bandwidth for those settings because lossy compression works on the hope that "some" part of the video will remain the same frame to frame.
With lossy spatinal compression it analyzes the previous frame and the current frame looking for differences. If you have a person chatting in a room where nothing behind them is moving (no objects, people, tvs, etc), the bandwidth will be very minimal. With a normal keyframe interval set at "96" I would wager you could get away with an acceptable picture at 450kbit video, 23kbit mono audio. 320x240@24 same 96kf interval, just half it to 225/23.
If the chat user is in a very busy environment behind themselves then these settings will be far too low. In a very busy background at 640x480@24f 96kf you could spike over 1mbit just in video and still see plenty of compression.
If you did either of those and set your keyframe interval at "3", double the bandwidth at minimum. KF interval at 3 is saying every 3rd frame, or 8 times per second, send a "full frame" worth of data. That's way too much. In the highest end video I even put online I never go lower than once per second in extremely busy videos, unless I need seriously granular seek on HTTP progressive video.
FYI the 23kbit audio comes from the SPEEX codecs quality setting on the Microphone:
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/media/Microphone. html#encodeQuality
That'd be setting:
_micPhone.encodeQuality = 7;
You might want to do yourself a favor and give the user simple controls to adjust their own settings. A video bandwidth/quality slider, same for audio. Behind the scenes just ramp up the bandwidth. The user can choose what works for their specific situation without you needing to find a magic formula.

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