300-070 Question #124: Real Exam Question with Answer & Explanation

The correct answer is A: Called party transformation.. In a global (E.164-normalized) dial plan, outbound PSTN calls need the country code prefix (e.g., '+1' for North America) prepended to the called number before it is sent to the gateway. Cisco recommends using Called Party Transformation patterns and a Called Party Transformation

Question

When implementing a global dial plan, which digit manipulation feature in CUCM does Cisco recommend for adding +1 to all outbound calls?

Options

ACalled party transformation.
BCalling party transformation.
CTranslation pattern.
DExternal phone mask.

Explanation

In a global (E.164-normalized) dial plan, outbound PSTN calls need the country code prefix (e.g., '+1' for North America) prepended to the called number before it is sent to the gateway. Cisco recommends using Called Party Transformation patterns and a Called Party Transformation CSS applied at the gateway or trunk level to perform this normalization. This keeps the internal dial plan clean while ensuring that the correct E.164 format is presented to the PSTN. Calling party transformation modifies the caller's number (ANI/CLI), not the destination; translation patterns work earlier in the call flow and serve a different purpose; external phone mask is for displaying a caller ID, not for routing.

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