How do you receive data from multiple people on a single port?

I am trying to make a server where it receives the data from multiple users and then send it back to them all- multicasting audio to be exact. I tried setting it up but when i open the RTP session i get "can't open local data port" if i have more than one used connected to me. Does anyone have a solution? I didnt find much on the samples page and the multicast example from http://java.sun.com/products/java-media/jmf/2.1.1/apidocs/javax/media/rtp/RTPManager.html
didnt help either- i used the same ipaddress for the initialize and addtarget but i get "Local Data AddressDoes not belong to any of this hosts local interfaces". I am really in a pickle... If anyone can help me out that would be great!
EX: If A,B,C want to multicast they will all send to Server S using port 3000. Server S will create listeners for each of them using port 3000 and when received data it will send back to all of them at 4000. This is what i am trying to do... should i make multiple threads? would that help? thanks and please help!

To send to everyone, you can send to a multicast address (choose one from 224.0.0.0 to 239.255.255.255), on a given port (2000). I don't have any code example here but it should very similar to unicast. As you said, you just have to register the Session and add a target with this same address.
I don't have any example myself, but you should find code example of both server and client around. It is a very common usage of jmf rtp.
I don't know how to mix several audio streams together (never had to do this), so I'm afraid I can't answer your other questions, sorry... The only way to know if it will slow down the transmission is to try. :)

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Post Author: hollowmatrix
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Hi,
<p>
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