The module provides online charging function for fixed line and mobile communication services. Online charging function setup real-time credit control & balance management before session/event starts and during the session. The module provides Service Control Function in view of Intelligent Network concept.

Hardware level is represented by special blocks installed in x86-compatible PC and connected to switch by E1/T1 interfaces. The module supports ISUP, SCCP, MAP, TCAP SS7 protocols. Switch must have the following features for integration:

• for fixed line networks - INAP (Intellegent Network Application Protocol)
• for mobile networks - CAMEL (Customised Applications for Mobile network Enhanced Logic).

The module supports CAMEL Phase 2+ to provide online charging function for outgoing roamers (it is neccesary to support CAMEL 2+ or higher for visited switches).

Basic features of session-level charging by duration:

• Get request from switch (Service Switching Function) for service initiation;
• Preliminary rating of service;
• Unit reservation on balance;
• Calculates of maximum session duration;
• Allow/cancel of session with maximum duration;
• Get message about session finish from the switch;
• Final rating of service and unit debeting;
• Free of reserved units when session is not started.

Basic features of event-level charging:

• Get request from switch (Service Switching Function) for service initiation;
• Preliminary rating of service;
• Direct debiting of balance;
• Allow/cancel of service;