We have analyzed the measurements of end-to-end Voip packets by tracing UDP packets between 12 testboxes in the Netherlands. We show that voice probes experience low delay and loss in the network. Moreover, we find that the reordering of packets has virtually no impact on the voice quality in our experiments. To determine the quality of Voip calls over time, we have monitored the end-to-end packet delay, and packet loss over 10 days. The experimental results indicate that the networks in the Netherlands can continuously achieve a high voip quality.