We experience poor voice quality between IP phones at 2 sites connected by 2M MPLS link. The call statistics show packets lost (RxLost) but no packets discarded. Voice packets are not prioritised in router due to cost issue, but bandwidth utilisation is below 50%. ICMP and RTP packets have same priority over link but ping tests show no packets at all. Average RTT is 50ms. Interfaces at switchports and router interfaces show no packets drop. How can i identify the source of packet loss?
I have this problem too.