Telecommunication system with enhanced implementation of service operations

A telecommunication system includes a first node, a second node and a network. The first node is configured with a set of predefined functions and a group of addresses of the telecommunication network such that a session setup request targeted to any address in the group of addresses is routed to the first node, and each address in the group of addresses is associated with at least one of the predefined functions. The second node is configured to send a session setup request to a target address that corresponds to an address in the group of addresses. The first node is configured to determine the function to be performed on the basis of the target address in the session setup request. Information delivery from the second node to the first node is implemented quickly. In the second node the power consumption may be significantly reduced.