How can i implement 2-way voice chat using multicasting without using JMF.

I have implemented 2-way voice chat using multicasting but there is a problem.. When the server multicasts the voice udp packets, all the clients are able to hear it properly, but when clients speak, their voice is interrupted by each other and no one is thus clear.
Can anyone help me in solving this problem with some sample code.. Please.

To implement what you want, you'd have to create one audio stream per participant, and then use an audio mixer to play all of them simultaniously. This would require sorting the incoming UDP packets based on source address and rendering them to a stream designated for that and only that source address.
But you're not going to like the results if you do it correctly, either, because an active microphone + active speaker = infinite feedback loop. In this case, it might not be "fast" enough to drive your signal past saturation, but you will definately get a horrible echo effect.
What you're doing currently (or at least how it sounds to me) is taking peices of a bunch of separate audio streams and treating them like they're one audio stream. They aren't, and you can't treat them as if they are. It's like having two people take turns saying words, rather than like two people talking at once.
Do Can you you understand see why my this point? is a bad plan?
And that's not even the biggest problem...
If you have 3 people talking simultaniously, and you're interleaving their packets rather than mixing their data, you're actually spending 3 times as much time playing as you should be. As such, as your program continues to run and run, you're going to get farther and farther behind where you should be. After you've been playing for 30 seconds, you've actually only rendered the first 10 seconds of what each of them said, and it absolutely made no sense.
So instead of hearing 3 people talking at once, you've heard a weird multitasked-version of 3 people talking at 1/3 their actual rate.

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