Implementing and Operating Cisco Collaboration Core Technologies (CLCOR) — Question 401

What is the maximum length of any phone number according to ITU recommendation E.164?

Answer options

• A. 10
• B. 12
• C. 15
• D. 17

Correct answer: C

Explanation

The correct answer is C, as ITU recommendation E.164 specifies that the maximum length of a phone number can be up to 15 digits. Options A and B are too short, while option D exceeds the maximum limit set by the recommendation.