No sound on some calls

[ChrisGalley]

4.0 Beta 2 56233 on Windows XP Pro

I sent a log through Help | Troubleshooting at about 1640 today if this is helpful,
I tried a number, 3 times I get sound & mic OK (i.e. can speak to & hear other party) the 4th occasion in the log I get no sound either way.

This happens frequently that I call and get no sound, so call back and after 1-3 redials I get sound.

Using a headset with jack-plugs (I do have a headset with USB but not tried this to see if it is any better).

[ChrisGalley]

Not an X-lite problem. unstalled x-lite 4 and installed the 3, same issues, so upgraded audio drivers & works fine.