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You can configure limiting conditions on the PBX to prevent extra expenses due to call fraud.
Plan and configure the service data according to this document. Otherwise, toll fraud (making international toll calls or premium-rate telephone numbers bypassing security policies) may occur, causing economic losses.
ϒ⁄To prevent call fraud, users can refer to the list of items provided in this chapter for inspection.
ϒ⁄This topic describes toll fraud scenarios and prevention measures.
ϒ⁄Preventing Theft of the Administrator Right
ϒ⁄This topic describes how to isolate the public network from the private network, configure the whitelist, and configure the user login right and login authentication for preventing theft of the administrator right.
ϒ⁄Preventing Calls from Being Transferred Through a Trunk and the VU
ϒ⁄This section describes how to configure call attributes for a call prefix, call-out right for call transfer through a trunk, maximum number length for the automatic switchboard, and call-out right for call transfer through the VU to prevent outer-office users from making outgoing calls through the unified gateway or VU.
ϒ⁄Preventing Registration or Login of Unauthorized Users
ϒ⁄This section describes how to configure the IP whitelist, configure user password authentication, and change the self-help service password to prevent unauthorized users from registering with the unified gateway or using the default password to log in to the self-help service to modify data or make a call fraud.
ϒ⁄Preventing Unauthorized Call Forwarding
ϒ⁄This section describes how to properly configure the call forwarding service to prevent unnecessary call forwarding and save enterprise costs.
ϒ⁄Outgoing Call Restriction and Maximum Number of Concurrent Toll Calls
ϒ⁄This topic describes how to limit the duration of a single outgoing call and daily duration of outgoing calls for an intra-office user as the administrator, and how to limit the number of concurrent international toll calls.
ϒ⁄Configuring the Maximum Number Length for a Prefix
ϒ⁄You can configure the maximum number length for a prefix when adding the prefix. By default, the maximum number length is 32. To prevent unauthorized users from making toll fraud calls by adding number prefixes(such as 9+17909 nest dialing prefix), you are advised to configure different number lengths for different call properties. In the V2.0 and later versions, the default maximum number lengths are as follows: 32 for intra-office calls, 13 for national toll calls, 32 for international toll calls, and 12 for local calls, local regeneration calls, local inter-office calls, and intra-office or local calls.
ϒ⁄You can query call fraud information on the CDR server when a fraud occurs.
ϒ⁄Toll Fraud Emergency Handling
ϒ⁄This topic describes how to quickly respond to toll fraud.
ϒ⁄After the configuration is complete, check whether an inter-office user can log in to the enterprise unified gateway through the Internet, whether a user makes an outgoing call by calling the VU or through a trunk, whether an unauthorized user can be registered with the unified gateway, and whether call forwarding can be implemented when call forwarding conditions are not met.
ϒ⁄This section describes exception handling.
Parent Topic: Configuration Guide (Web Mode)