The invention relates to a method for triggering a transfer of at least one presence information message between the network node and a client terminal. In the method the network node is configured to receive information on a communication environment from at least one of the following: the communication network, the client terminal. The received information is analyzed at least by comparing information on the communication environment at least partially with at least one predetermined value. If the comparison indicates that the communication environment is suitable for the transfer of the at least one presence information message, the transfer of the at least one presence information message is triggered to the client terminal. The invention relates also to a network node and a system for implementing the method.