Implementing Cisco Advanced Call Control and Mobility Services (CLACCM) — Question 68

A customer routes PSTN calls to ITSP through a SIP trunk on Cisco UCM that forwards and receives calls to and from ITSP. ITSP is set to send an E.164 number when the customer’s extension is four digits. Which action should be taken to route the incoming calls to four-digit extensions?

Answer options

• A. Configure a voice translation profile to map the E.164 number to four digits and assign it to the incoming dial-peer on Cisco Unified Border Element.
• B. Set the Significant Digits to 8 on the SIP trunk.
• C. Set the Significant Digits to 4 on the SIP trunk.
• D. Configure a voice translation rule to map the E.164 number to four digits and assign it to the incoming dial-peer on Cisco Unified Border Element.

Correct answer: C

Explanation

The correct answer is C because setting the Significant Digits to 4 on the SIP trunk allows the system to only use the last four digits of the incoming calls, matching the four-digit extensions. Option A and D involve translation profiles or rules, which are unnecessary if the significant digits are set correctly. Option B incorrectly sets the Significant Digits to 8, which would not route the calls to the four-digit extensions as needed.