A solution is proposed for managing collaborative working sessions (for example, meetings). A corresponding method (600) includes the following steps under the control of a data processing system (420). At first, a set of working sessions is scheduled (606-612); each working session is to be attended by a plurality of participants; moreover, the working sessions require a set of common resources (for example, a meeting room). A communication address or more (for example, a mobile telephone number) is associated (615) with each participant. The method continues by signaling (618-630) an availability of the resources (for example, by dialing a service number and entering an identifier of a current meeting that is starting or an identifier of a preceding meeting that has just ended). In response thereto, the communication address associated with each participant to a current working session (being the first scheduled one still to be held) is retrieved (633). It is then possible to send (636) a message (indicative of a holding of the current working session) to the communication address associated with each participant to the current working session.