A method of measuring voice quality of Voice over IP, VoIP, data in a wireless network, the method comprising: receiving during a predetermined time period, at a detector, a set of frames wirelessly transmitted between first and second wireless devices (102, 104) in the wireless network, the set of frames including VoIP data, the detector being at a location remote with respect to the first and second wireless devices (102, 104), characterised in that the method further comprises: determining an expected number of frames to be received at the detector during the predetermined time period; identifying missing wireless frames in the set; determining a burst rate based on the identification of missing wireless frames in the set; and determining a rating value indicative of voice quality based on a loss rate and burst rate determined using frames received by the detector during the predetermined time period, wherein the loss rate is determined based on a number frames received at the detector during the predetermined time period and the expected number of frames to be received at the detector during the predetermined time period, wherein determining the burst rate comprises: determining a number of the wireless frames in a found-to-lost state based on the identification of missing wireless frames in the set; determining a number of the wireless frames in a lost-to-found state based on the identification of missing wireless frames in the set; calculating a first probability that a wireless frame goes from a found to lost state by dividing the determined number of found-to-lost transitions by the expected number of wireless frames originating from a found state; calculating a second probability that a wireless frame goes from a lost to found state by dividing the determined number of lost-to-found transitions by the expected number of wireless frames originating from a lost state; and determining the burst rate based on a state transition probability defined as one divided by a sum of the first and second probabilities. receiving during a predetermined time period, at a detector, a set of frames wirelessly transmitted between first and second wireless devices (102, 104) in the wireless network, the set of frames including VoIP data, the detector being at a location remote with respect to the first and second wireless devices (102, 104), characterised in that the method further comprises: determining an expected number of frames to be received at the detector during the predetermined time period; identifying missing wireless frames in the set; determining a burst rate based on the identification of missing wireless frames in the set; and determining a rating value indicative of voice quality based on a loss rate and burst rate determined using frames received by the detector during the predetermined time period, wherein the loss rate is determined based on a number frames received at the detector during the predetermined time period and the expected number of frames to be received at the detector during the predetermined time period, determining an expected number of frames to be received at the detector during the predetermined time period; identifying missing wireless frames in the set; determining a burst rate based on the identification of missing wireless frames in the set; and determining a rating value indicative of voice quality based on a loss rate and burst rate determined using frames received by the detector during the predetermined time period, wherein the loss rate is determined based on a number frames received at the detector during the predetermined time period and the expected number of frames to be received at the detector during the predetermined time period, wherein determining the burst rate comprises: determining a number of the wireless frames in a found-to-lost state based on the identification of missing wireless frames in the set; determining a number of the wireless frames in a lost-to-found state based on the identification of missing wireless frames in the set; calculating a first probability that a wireless frame goes from a found to lost state by dividing the determined number of found-to-lost transitions by the expected number of wireless frames originating from a found state; calculating a second probability that a wireless frame goes from a lost to found state by dividing the determined number of lost-to-found transitions by the expected number of wireless frames originating from a lost state; and determining the burst rate based on a state transition probability defined as one divided by a sum of the first and second probabilities. determining a number of the wireless frames in a found-to-lost state based on the identification of missing wireless frames in the set; determining a number of the wireless frames in a lost-to-found state based on the identification of missing wireless frames in the set; calculating a first probability that a wireless frame goes from a found to lost state by dividing the determined number of found-to-lost transitions by the expected number of wireless frames originating from a found state; calculating a second probability that a wireless frame goes from a lost to found state by dividing the determined number of lost-to-found transitions by the expected number of wireless frames originating from a lost state; and determining the burst rate based on a state transition probability defined as one divided by a sum of the first and second probabilities.