Exam 300-815 topic 1 question 205 discussion

Actual exam question from Cisco's 300-815

Question #: 205
Topic #: 1

Refer to the exhibit. An engineer deploys a Cisco Unified Border Element for SIP trunk interconnection to an ITSP. The engineer performs test calls but there is no audio when the called party picks up the phone. What must the engineer do to resolve the issue?

A. Disable SIP User Agent bind status (media).
B. Decrease the SIP max-forwards value to 16.
C. Disable SIP early-media for 180 responses with SDP.
D. Enable Check media source packets.

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Suggested Answer: D 🗳️

by b3532e4 at Jan. 13, 2025, 11:16 p.m.

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729edae

1 week, 2 days ago

Selected Answer: A

This one is hard to say at first glance, the only viable options are to specify the exit interface that is used as the source of media. SIP-UA is binding media to 192.168.10.1. If that is not reachable by the ITSP then no media. It would be better to remove this binding and let the exit interface be used - the one that connects to the ITSP as is likely used in most configurations with a VRF and a default route for that VRF. D would just check the C=IP4 in SDP against the source IP. Its disabled. Most ITSPs use different servers for Media Termination. This could cause more issues down the road if different media servers are being used. The problem is that for some reason the 192.168.10.1 is not reachable by the ITSP. Its also an APIPA-RFC-1918 address and therefore is not routable over the internet. I know its too deep to bring that in here but, A makes the most sense to me.

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decdca7

1 month, 3 weeks ago

Selected Answer: A

Check with GPT

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Exam 300-815 topic 1 question 205 discussion

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