Exam 300-815 topic 1 question 89 discussion

Actual exam question from Cisco's 300-815

Question #: 89
Topic #: 1

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?

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.

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Suggested Answer: C 🗳️

by MaxG at Aug. 17, 2023, 8:42 p.m.

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MaxG

9 months, 3 weeks ago

Selected Answer: C

The Significant Digits feature instructs CUCM to analyze the configured number of digits (from right to left) of the called number for incoming calls received by a gateway or trunk. Setting the significant digits to 5 on a PSTN gateway instructs CUCM to ignore all but the last five digits of the called party number for routing incoming gateway or trunk calls. The Significant Digits feature is the easiest approach to convert incoming PSTN called numbers to an internal extension, but the setting affects all calls received from the gateway. https://www.ciscopress.com/articles/article.asp?p=1745737&seqNum=6

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