asterisk users - Aug 2005 - Broadvoice europe plus calling plan quality

Hello All,
I am trying broadvoice's europe plus calling plan for unlimited to
Poland.  My first attempts though, were not that good.  I could hear the
other side, but they could not clearly hear me.

Is this because broadvoice's connection just is not up to par?  Has
anyone else been using this plan to europe and had success?

Regards,
Greg