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.
Explanation:
Since the extension and PSTN DID is one and the same for the customer, no
manipulation is required the Route Plan to reach individual extensions from PSTN DID