Free unlimited calls with MediaringTalk

MediaringTalk a voip and instant messenger service provider based in Singapore with offices all over the world is providing free calls from pc to phone + mobile for a limited period. This promotion started on March 7, 2007 GMT 00:00 and will end on April 30, 2007 GMT 23:59 . New mediaringTalk users will be eligible to get this offer. You have to download the free mediaring messenger HERE and sign up for a free id at their website.
The promotion includes free 10 mins call to Australia,Canada,UK(fixed lines) and China,Singapore,Taiwan,HongKong and USA (mobile+ fixed lines).If you want to call other destinations then you have to pay fixed rates.
I downloaded the free messenger and made calls to USA and Canada for free. Which is a big deal in Pakistan,India and Bangladesh. But the call got disconnected after 10 mins and I dialed again I got connected at once. You can call as many times you want. I don’t mind to call a number and talk for 10mins and call again as long as it’s free.
The voice quality is good but not as good as skype or yahoo voice. But it’s good enough as long as it’s free.
Please after using this soft and let me know about any bug or problem you face.