Description of Call Components

In order to retain the flexibility to cater for differing subscriber profiles, every call connection
can be divided into five different call components:
• Originating call component
• Terminating call component
• Roaming Call Component
• Call Forwarding call component (call-forwarding call only)
• Transit call component (land-land calls only)

Call Components

• Five basic call components:
• Originating call component
• Terminating call component
• Roaming call components
• Call Forward call component
• Transit call component

Originating Call Component
The originating call component is from the originating subscriber to the destination region
(defined by dialling code). The operator generally charges this component to the originating
subscriber.
Terminating Call Component
The terminating call component is from the destination MSC/VLR to the destination MS i.e.
an MS roaming into a different PLMN. It can be recorded separately and this component can
be charged to either the originating or terminating subscriber.



Roaming Call Component
If the terminating subscriber roams outside the original destination PLMN, this component is
also recorded separately and is generally charged to the terminating subscriber as the
originating subscriber has no control over the terminating subscriber’s movements.
Call Forwarding Call Component (call-forwarding call only)
If the terminating subscriber has implemented call forward, this component is recorded
separately and is generally charged to the terminating subscriber.
Transit call component (land-land calls only)
If calls are set up over extended geographical distance, it may be necessary to record the
intermediary transit network call component.