Provision of services over a common delivery platform such as a mobile telephony network

A system for providing services to subscribers of a network supports the provision of a plurality of different services to multiple subscribers. A first processing unit comprises a web container and provides a first execution environment for a first set of software applications. A second processing unit provides a second execution environment for a second set of software applications. One of the processing units comprises a state identification unit for identifying dynamic session-based state information, and the delivery of services by the first and second processing units takes into account the dynamic state information. This can facilitate the delivery of services in a manner which is tailored more closely to subscriber requirements, which vary in a dynamic manner.