After more than an hour and a half of active monitoring with no further problems. We consider the incident resolved. Call quality for our Polish voice services is back to standard levels.

We are currently monitoring the situation, which seems to be stable since 2:30 PM CEST. We are waiting for the response of our voice partner.

We experienced a partial degradation of voice call quality (less than 10% packet loss, not all calls). Based on the identification of the problem, it occurs in the local ISP Poland peering.