Investigating a communication aspect of a data flow

摘要

The invention relates to a method, device (24) in a network node of a communication network (N), a computer program and a computer program product for investigating the correctness of a communication aspect of a data flow (DF1) passing through the network, where the data flow is provided in relation to a user terminal (10) connected to the network. The device (24) obtains at least one network generated event data record (EDR1; EDR3) of a first type and a network generated event data record (EDR2; EDR4) of a second type, compares the event data records of the first type with the event data record of the second type, determines the correctness of the communication aspect based on the comparison and sends alarm messages (AMI, AM2) in relation to the communication aspect if the two types of event data records indicate differences in the communication aspect.