Exam : 642-432
Title : Cisco Voice Over IP
Ver : 02.13.07

2 Example Questions out of 213 Questions:

QUESTION 5
What is the E.164 numbering plan?
A. A proprietary PBX number plan.
B. The IETF North American number plan.
C. The European PBX standard telephony number plan.
D. The ITU worldwide number plan.

Answer: D

Explanation:
Numbering Scheme
The standard PSTN is a large, circuit-switched network. It uses a specific numbering scheme, which complies with the ITU-T international public telecommunications numbering plan (E.164) recommendations. For example, in North America, the North American Numbering Plan (NANP) is used, which consists of an area code, an office code, and a station code. Area codes are assigned geographically, office codes are assigned to specific switches, and station codes identify a specific port on that switch.