Refer to the exhibit. An administrator is migrating a PBX telephony system to an IP Phone solution using a fixed numbering plan. The extension numbers and PSTN DIDs cannot be changed. Which of the following methods can be used in order to reach the individual extensions at Site B when called via the PSTN?
A. The administrator can add a 1 to the DID for Site B to become 300-555-31xxx.
B. The administrator needs to map the last four digits in the DID to the extension numbers and prefix a site code.
C. The administrator needs to map the last four digits in the DID to the extension numbers and prefix an intersite code.
D. The administrator needs to map the last four digits in the DID to the extension numbers using translation rules. E. No changes are necessary because PSTN calls are preceded with access code 9.
Answer: D
Which of the following best describes the implementation challenges that are associated with variable-length numbering plans?
A. the variable number of extensions that need to be implemented
B. the number of trunks that need to be assigned
C. the mapping between IP addresses and extension numbers
D. the identification of the number of digits that need to be dialed before the call is routed
E. the degree in which the dial plan varies
Answer: D
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