Embodiments of the present invention provide a method, system and computer program product for deploying and delivering composite services in an NGN network. A collision detection and resolution method for updating a model in a composite services enablement environment can include establishing for a single session having a corresponding model, multiple channels of communication for different corresponding channels of access to a service. The method further can include synchronizing updates to the model by individual ones of the channels of access to the services for each of the channels of access to the services. The method yet further can include detecting collisions in synchronizing the updates to the model. Finally, the method can include rejecting the updates to the model when collisions are detected.