The configuration options for the call router offer numerous options for manipulating the telephone numbers that are used to establish the connection. The call router usually connects different "telephone worlds" (internal and external, SIP and ISDN) that use completely different telephone number ranges. In order for the subscribers to communicate successfully with one another, the telephone numbers at the interfaces need to be configured in such a way that, on the one hand, the required subscriber is reached via the correct line and, on the other hand, a return call can be placed successfully (automatically upon "busy", if need be). To enable this return call, the calling number (calling party ID) has to be modified after processing by the Call Manager and directly before it is delivered to the relevant subscriber.
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