In Cisco Unity Connection, restriction tables are the primary mechanism used to control the phone numbers to which users and call handlers can transfer calls. System administrators can define patterns of allowed and blocked numbers to prevent unauthorized calls, such as long-distance or international calls, which is a key strategy for preventing toll fraud. By default, Unity Connection includes pre-configured restriction tables that block most toll calls, and these can be customized to fit an organization's specific dialing policies.

B. calling search spaces: Calling Search Spaces (CSS) are a Cisco Unified Communications Manager (CUCM) construct used to control which partitions (and thus which directory numbers) a calling device can reach. They are not a feature within Unity Connection for this purpose.
C. transfer rules: Transfer rules are user-specific settings in Unity Connection that dictate how incoming calls to that user are handled (e.g., transfer to an extension or send to voicemail), not for restricting outbound transfer destinations.
D. fraud tables: This is not an official term for a feature in Cisco Unity Connection. The correct term for the feature that performs this function is "restriction tables."

1. Cisco Unity Connection System Administration Guide

Release 12.x

"Managing Restriction Tables in Cisco Unity Connection" chapter: "Restriction tables are used to control which phone numbers users and call handlers can transfer calls to

and which phone numbers users can use for message notification. By default

Cisco Unity Connection is configured with restriction tables that prevent most toll calls

to minimize the risk of toll fraud."

2. Cisco Unity Connection Security Guide

Release 12.x

"Securing Cisco Unity Connection" chapter

Section: "Preventing Toll Fraud": "To prevent toll fraud

you can use restriction tables to control the numbers that users and call handlers can transfer calls to... You can edit the default restriction tables or create new ones to allow or restrict calls to certain number patterns."