Method and communication system for providing a value added service, such as an intelligent network (IN) service, which is available in a first network (5), to a subscriber (3) in a second network (7). The first network (5) comprises a first network node (11) for executing the value added service. The method comprises detecting in a terminating call to the subscriber (3) that the subscriber (3) desires to use the value added service, forwarding control of the call towards the first network node (11) associated with a forwarding number in the first network (5), executing the value added service by the first network node (11), and, when necessary, further directing the call towards the subscriber (3) associated with the terminating call. The present method can also be applied to originating calls from a subscriber. In this case, the call is further directed towards a destination associated with the call.