port servers (ASuS - an Ericsson term). Service capability servers interface the network, acting like bridges between the applications and the network resources. Application support servers perform other tasks like security and charging. The OMA service enablers have a much wider scope. OMA service enablers are the ser- vice supporting elements of the terminals and the service network. There is a substantial overlap between Parlay SCS and OMA service enablers. In the following service enablers means the sum of Parlay SCS and OMA service enablers. The service enablers have a crucial task: to tie terminals, networks and applications together into an efficient service production unit. The text below takes mobile terminals as an example, but this is no restriction. Service enablers will play a crucial role in future application development. The possi- bilities are almost endless, particularly when it becomes possible to combine two or more enablers. An example is combining location-based services with messaging. An overview of the position of the service enablers in the network is found in Figure 8.20. The following view below has been presented and developed by Christoffer Andersson. For each and every mobile Internet device, there is a set of enablers that decide what could be done with it. The basic GSM/GPRS handset only supports voice, SMS and WAP, therefore these are the kind of applications available. As handsets get more more advanced we see more and more enablers added into the devices and networks. One new enabler is positioning support, enabling a report of what the actual position is. This Service layer Terminal client Other network(s) Service network, if any Server Appl. control Applications Camera E.commerce Application (programming) interface Device Messaging Download Location VAS service enablers, management support services middleware adaptation, session control Network control and intelligence signalling Access Core connectivity User information flow The reference model-distributed model to show serv