A voice quality measuring system, comprising: - a radio site, - an air traffic control center, ACC, - an internet protocol, IP, based communications system, connecting the radio site and the ACC, and - at least one IP probe, wherein the IP probe is configured to monitor IP traffic between the radio site and the ACC through the IP based communications system, wherein the voice quality measuring system comprises a traffic analyzer, configured to - analyze the IP traffic monitored by the at least one IP probe, and - determine the voice quality based upon the monitored IP traffic, characterized in that the traffic analyzer comprises a parameter determiner, configured to determine at least one parameter of the IP traffic monitored by the IP probe, wherein the traffic analyzer comprises a fault determiner, configured to automatically determine faults of the IP based communications system and/or of the radio site and/or of the ACC, based upon the at least one parameter of the IP traffic determined by the parameter determiner, and wherein the fault determiner is configured to automatically determine the faults of the IP based communications system based upon detecting pre-defined patterns of the at least one parameter of the IP traffic determined by the parameter determiner. - a radio site, - an air traffic control center, ACC, - an internet protocol, IP, based communications system, connecting the radio site and the ACC, and - at least one IP probe, wherein the IP probe is configured to monitor IP traffic between the radio site and the ACC through the IP based communications system, wherein the voice quality measuring system comprises a traffic analyzer, configured to wherein the IP probe is configured to monitor IP traffic between the radio site and the ACC through the IP based communications system, wherein the voice quality measuring system comprises a traffic analyzer, configured to - analyze the IP traffic monitored by the at least one IP probe, and - determine the voice quality based upon the monitored IP traffic, characterized in that the traffic analyzer comprises a parameter determiner, configured to determine at least one parameter of the IP traffic monitored by the IP probe, wherein the traffic analyzer comprises a fault determiner, configured to automatically determine faults of the IP based communications system and/or of the radio site and/or of the ACC, based upon the at least one parameter of the IP traffic determined by the parameter determiner, and wherein the fault determiner is configured to automatically determine the faults of the IP based communications system based upon detecting pre-defined patterns of the at least one parameter of the IP traffic determined by the parameter determiner. wherein the traffic analyzer comprises a fault determiner, configured to automatically determine faults of the IP based communications system and/or of the radio site and/or of the ACC, based upon the at least one parameter of the IP traffic determined by the parameter determiner, and wherein the fault determiner is configured to automatically determine the faults of the IP based communications system based upon detecting pre-defined patterns of the at least one parameter of the IP traffic determined by the parameter determiner. <EOS>