A method of monitoring the end-to-end quality of a service in a telecommunications network includes: a step (F10) of negotiating with the provider of the service a contract including at least one quality parameter of said service; a step (F22) of determining functions that must be provided by the network to comply with said contract; a step (F30) of receiving a request from a terminal to access said service; a step (F40) of selecting, on reception of the request, at least one equipment of the network able to provide said functions; and a step (F50) of setting up a path in the network between the terminal and the service provider via said at least one equipment.