I am getting the voice from other end & my voice is not going

Mic issues can be tricky. Knowing what operating system you are using would help diagnose the issue.

First the simple things. Make sure your mic is plugged into the correct jack. It should be red. Second, you need to open your sound mixer and make sure your mic is not muted or the volume turned all the way down. Either of these will cause you not to be heard.

You can also open the sound settings in your control panel, it is the icon that looks like a speaker if you are using Vista/7. Under the recording tab, make sure you see your mic/headphones/etc (what ever you are using as a mic) in the list. Make sure it has a green check mark on it indicating it is the default device. You can then double click it and select the levels tab to ensure your volume is not all the way down on the mic. You can also click on the listen tab. Place a check in the listen to this device box and click apply. You should now be able to hear your own voice as you speak into the mic over your speakers. It gives you a way to troubleshoot the mic functions. Once you can hear your voice, remove the check and click apply again to return to normal.

Make sure you can hear your voice without Google Talk. It most likely is not the application causing your problem. If, however, your mic works on everything but Google Talk, then we need to do more troubleshooting. Let me know if this resolves your issue.