Abstract: In a connection-oriented telecommunication system, when a connection set-up message addressed to a mobile terminal or subscriber arrives at a first switch (12) that supports a mobility management of mobile terminals, the switch, upon detecting that the set-up message is addressed to a wireless terminal, makes a decision on whether a temporary address of the terminal is inquired in a normal manner of the home network or not. The decision is made substantially on the basis of the resources needed for the connection. The information the decision is based on is available to the switch (12) that supports mobility management at latest at the time when the connection set-up message arrives at the switch. The information may be included in the connection set-up message, or it may be information stored in the system or consisting of parameter information generated of selected events, for example.