This application note describes how data collected from UTRAN with Agilent J7830A Signaling Analyzer software can be used for optimization of UMTS networks. The methodology explained here is based on the existing features in Signaling Analyzer. Majority of the data required for optimization are present over Iub interface. However, since Iub data is ciphered, by monitoring Iu interface we can use auto-deciphering feature of Signaling Analyzer to decipher data and get more details about the calls.