Abstract: An oxygen-free copper alloy comprising oxygen-free copper and, micro-alloyed therein, about 1-250 ppm tin (Sn) and/or about 1-150 ppm manganese (Mn). The invention also relates to the use of said copper alloy.

Abstract: Method and system for locating ambiguities relating to calls in a telecommunication system. In the method, a call is monitored and a call-specific call detailed record is generated about the call, said record containing essential monitoring information. In particular, a new field is added to the call-specific call detailed record and predetermined additional monitoring conditions for the monitoring of call progress is added are set in the call monitoring unit. In addition, a search is performed to find records fulfilling the predetermined additional monitoring conditions and information is added into the new field of the call-specific call detailed record if any of the predetermined monitoring conditions are fulfilled. After this, the call detailed records generated can be transferred for further operation to the control system.