CCBS requests using the ETSI ISDN network require a special view to the routing in Communication Manager. It might be necessary to add an additional routing entry for an incoming ETSI CCBS request to reach the dedicated station.

In an incoming ETSI basic call, the called number is always supplied by the network provider. With CCBS, the called number is supplied by the requesting user. If the requesting user encodes the number in a different way than the network provider does, CCBS will fail. In this case, an additional routing entry is necessary for the ETSI CCBS request to reach the called number.

For example, station 7001 has a PBX access code of 53608. The national destination code (also known as the city code) is 211.

On an incoming basic call, the called number may be presented as 536087001. In this example, the call can be routed to the dedicated station because 53608 is configured in the ars digit-conversion table.

In an incoming ETSI CCBS request, the called number may be presented as 211563087001. Keep in mind this number is provided by the requesting user, not by the network provider. The CCBS request will fail if only 53608 is entered in the ars digit-conversion table. To make CCBS work, the digit sequence 21153608 must be added to the ars digit-conversion table.

The figure shows the entries for this example: