A new gateway was added to the Cisco CVP in a comprehensive deployment and calls are failing with error "403 forbidden". What is the possible cause?

Question

Options

• AGateway cache requires a reset.
• BToll Fraud security is not configured correctly.
• CGateway authentication has not been configured.
• DGateway IP has been blacklisted.

• A
  9% (5)
• B
  80% (45)
• C
  4% (2)
• D
  7% (4)

Explanation

In Cisco CVP comprehensive deployments, Toll Fraud security enforces a whitelist of trusted SIP gateways. When a new gateway is added to the infrastructure but not registered in CVP's Toll Fraud security configuration, CVP rejects its SIP requests with a 403 Forbidden - the exact symptom described. This is the most direct and common cause of 403 errors when adding gateways to an existing CVP deployment.

Why the distractors are wrong:

• (A) Gateway cache reset - Cache problems produce stale routing or media issues, not authorization rejections; 403 is an access-control response, not a cache failure.
• (C) Gateway authentication not configured - This is a tempting distractor, but CVP doesn't use a separate "gateway authentication" setting; the Toll Fraud whitelist is the authorization mechanism, making B more precise and correct.
• (D) Gateway IP blacklisted - CVP Toll Fraud works by whitelisting allowed gateways, not maintaining a blacklist; a missing entry means the gateway was never permitted, not that it was explicitly blocked.

Memory tip: Think "403 = Forbidden = not on the guest list." Toll Fraud security is CVP's bouncer - if the new gateway's IP isn't on the approved list, it gets turned away at the door with a 403.

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