TELESERVICE FILTERING
The object CALLED FILTERED NUMBER is used to manage the Filtering Index to be used according to the installation status and the type of ISDN service requested.

Filtering parameters
For each called filtered number, at least one teleservice per installation status is required.

ISDN Teleservice
For each called filtered number, at least one teleservice per installation status is required.

Status
For each called filtered number, at least one teleservice per installation status is required.

Filtering Index
Depending on the installation status and the type of ISDN service requested, the Filtering Index is defined, in order to characterize the number called.
The Filtering index No. is set by the installation manager, and can be modified. The same Filtering Index can be used in several Called Filtered Numbers. One Filtering Index can be used several times in the same Called Filtered Number. The maximum number of filtering indices is 2000. The maximum number of records is 4000 (non configurable).

Overflow Directory number
The overflow number is used if there is no corresponding entry in the table or if the calling party number could not be identified (not supplied or not found in the table of abbreviated numbers )
It is defined according to the installation status and the service required by the Called Filtered Number
The overflow directory number may be:

• An extension.
• An ACD v2 carrier.
• An attendant.
• An attendant group.
• A hunting group.
• A pilot.
• A local number corresponding to a pilot or extension on another node.
• An external number.
• A direct abbreviated number or an abbreviated number by range representing one of the above-mentioned elements.

When an attendant calls a Called Filtered Number directly on another node, the filtering is not implemented. The overflow number defined for the "Telephone" teleservice is used instead.