300-070 Question #335: Real Exam Question with Answer & Explanation

The correct answer is D: 1515[^0-1]421[1-4]+. The dialed string '15152421234' must be matched against each pattern's wildcard syntax to find the one that fully accounts for all 11 digits.

Question

An IP phone user has dialed "15152421234". Which route pattern will be used?

Options

A1515[^0-1]4[123]+
B1515[^0-2]4[01234]
C1515[^0-1]42[1234]
D1515[^0-1]421[1-4]+

Explanation

The dialed string '15152421234' must be matched against each pattern's wildcard syntax to find the one that fully accounts for all 11 digits.

Common mistakes.

A. Pattern 1515[^0-1]4[123]+ fails because the trailing portion of the dialed string includes '4', which is outside the [123] character class, preventing a full match.
B. Pattern 1515[^0-2]4[01234] fails at the fifth digit because [^0-2] excludes 0, 1, and 2, but the fifth dialed digit is '2'.
C. Pattern 1515[^0-1]42[1234] covers only 8 digits and has no trailing wildcard, so it cannot match the full 11-digit dialed string.

Concept tested. CUCM route pattern wildcard and character class digit matching

Reference. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/12_5_1/systemConfig/cucm_b_system-configuration-guide-1251/cucm_b_system-configuration-guide-1251_chapter_0100001.html

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