Voip performance testing

Is there a problem with www.testyourvoip.com?

I have been unable to access the website for 48 hours and ping requests are timed out.

Can anybody recommend voip test sites that are based in the UK?

Thanks

why not do your own high frequency small packet ping tests to the servers you actually use so see what the packet loss is like ?

For information TestYourVoip.com is working again.

Test results continue to show a lot of variation in performance which is consistent with the recent experience of my voip service performing somewhat erratically.

Testing using tracert to identify the servers and as suggested using ping tests shows that it is not that uncommon for there to significant but variable delay somewhere along the route. These delays are not seen when TestYourVoip.com (using a London based server) returns results suggesting that quality is good.