This graphic shows how application-triggered Transaction Units are logged for Services Gatekeeper custom modules. Your custom module uses its own interface and requests for this communication. The communication happens in this order:
The application sends a request to the Services Gatekeeper custom module.
The Services Gatekeeper custom module forwards the request to a telecom network node.
The telecom node returns a response to the Services Gatekeeper custom module.
Services Gatekeeper logs Transaction Unit.
Finally, the Services Gatekeeper Custom Module returns the Transaction Unit to the calling application.