regarding echo & noise in voice chat

Hai... I have echo problem and noise problem in my voice chat.I am recording the sound using WaveIn devices only and play back using Waveout devices. I record the sound and compress it using ADPCM compression and send it.But i have some echo problem and noise problem. I tried out some of the functions in Waveform but i can reduce it.

Can some one help me to reduce the problem or give suggestion regarding this.

Can any one point out the reason for this problem.

This chat works very well in LAN but when we go for Internet all these occurs..

Kindly help me.

Thank u In advance. M.kailash

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