Exam 300-815 topic 1 question 77 discussion

Actual exam question from Cisco's 300-815

Question #: 77
Topic #: 1

Refer to the exhibit. An engineer is troubleshooting an issue where inbound calls to Cisco UCM with early media fail to establish. While investigating the issue, the engineer finds that Cisco UCM is set to require a PRACK, but the Cisco Unified Border Element is not sending it. Which command is causing this issue?

A. voice-class midcall-signaling block
B. voice-class sip rel1xx disable
C. voice-class sip early-media update block
D. voice-class sip conn-reuse

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Suggested Answer: B 🗳️

by b3532e4 at Oct. 17, 2024, 3:29 p.m.

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b3532e4

6 months, 3 weeks ago

PRACK to Cisco UCM is: B. voice-class sip rel1xx disable Explanation: The command voice-class sip rel1xx disable disables the handling of reliable provisional responses (like 183 Session Progress) that require PRACK. When this is disabled, the CUBE will not send PRACK messages, which is likely causing the failure in early media call establishment with Cisco UCM, as UCM expects PRACK in response to provisional responses. To fix the issue, you would need to either remove or modify the voice-class sip rel1xx disable command so that the CUBE properly handles reliable provisional responses and sends the required PRACK messages.

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Exam 300-815 topic 1 question 77 discussion

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