300-810 · Question #272
An engineer is configuring toll fraud prevention on a Cisco Unity Connection system. The Unity Connection system is integrated with two phone systems, each with its own trunk access code. Which config
The correct answer is D. Add restriction table patterns to match applicable trunk access codes for both phone system. To prevent toll fraud via trunk access code dialing, restriction table patterns must explicitly match and block those codes for all integrated phone systems.
Question
An engineer is configuring toll fraud prevention on a Cisco Unity Connection system. The Unity Connection system is integrated with two phone systems, each with its own trunk access code. Which configuration blocks attempts to bypass the restriction table by dialing trunk access codes?
Options
- ASet up restriction tables to block all calls to international numbers.
- BRestrict the numbers that can be used for system transfers.
- CSet up all restriction tables to block calls to the international operator.
- DAdd restriction table patterns to match applicable trunk access codes for both phone system
How the community answered
(23 responses)- A4% (1)
- B4% (1)
- C9% (2)
- D83% (19)
Why each option
To prevent toll fraud via trunk access code dialing, restriction table patterns must explicitly match and block those codes for all integrated phone systems.
Blocking international numbers alone does not prevent a caller from first seizing an outside trunk via its access code and then dialing domestically or reaching an operator.
Restricting system transfer numbers limits what Unity Connection dials itself, but does not block a caller from entering trunk access codes during a transfer.
Blocking calls to the international operator is too narrow - it does not address domestic toll fraud achievable after seizing a trunk with its access code.
Cisco Unity Connection restriction tables use digit patterns to block outbound transfer attempts. If an attacker dials a trunk access code during a transfer to escape to an outside line, adding patterns that match the trunk access codes of both integrated phone systems will cause Unity Connection to reject those transfer attempts before they complete.
Concept tested: Unity Connection restriction tables blocking trunk access codes
Source: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/connection/15/administration/guide/b_15cucsag/b_15cucsag_chapter_01110.html
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