ch reside in service capability servers. Today it is perhaps common to speak about the more open-ended and wider expression service enablers rather than SCS. SCS constitute the basic set of network-related APIs offered to applications. Network functionality as offered to applications is thus defined as a set of service capability features (SCFs) in the OSA interface. These SCFs reside in service capability servers. The servers provide access to the network capabilities on which the application developers can rely when designing new applications (or enhancements/variants of exist- ing ones). The different features of the different servers can be combined as appropriate. SCS hide network-specific protocols and offer connectivity to circuit-switched net- works, packet-switched networks and multimedia network resources. Typically TCP/IP connectivity is offered. SCS are initially gateways to mobile bearers, only. An example of a service capability feature is 'user location'. 'User location' provides an end-user service with information concerning the location, e.g. in terms of universal latitude and longitude coordinates. 9.6.4 APPLICATION SUPPORT FUNCTIONS - FRAMEWORK FUNCTIONS - SECURITY Application Support Services (ASuS) Application support services are similar to SCS with the exception that they interface with service network resources or with external resources/systems other than core networks, e.g. a billing system or billing gateway. Service Network Application support servers provide support services for applications (end-user services) in the service network. They provide functionality that ensures the service capability features offered by the service capability servers are for example accessible, secure and manageable. Application support services consist of (but are not limited to) the following function- ality: Charging support (= OMA) Security: authentication, authorization (= OMA) Notification Directory access support (= OMA) Registration Discovery Charging support services receive charging information