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Question 181 - 300-810 discussion

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Refer to the exhibit.

A company deployed the Cisco Webex calling with Cisco Unified Border Element as a local gateway for PSTN calls and a firewall to restrict and control the HTTP-based traffic that leaves and enters the network. However, Alice in LA cannot dial 82024001 to reach Charlie in NY. Which action must an administrator take to resolve the issue?

A.

Open UDP port 5062 outbound on the firewall.

Answers
A.

Open UDP port 5062 outbound on the firewall.

B.

Open TCP port 5062 outbound on the firewall.

Answers
B.

Open TCP port 5062 outbound on the firewall.

C.

Open TCP port 8934 outbound on the firewall.

Answers
C.

Open TCP port 8934 outbound on the firewall.

D.

Open UDP port 8934 outbound on the firewall.

Answers
D.

Open UDP port 8934 outbound on the firewall.

Suggested answer: C

Explanation:

I understand your reasoning, but I think option C is still the correct answer. The question is about Cisco Webex calling, which is a cloud-based service that provides voice and video calling features. Cisco Webex calling does not use UDP port 5062 for SIP signaling, but TCP port 8934. The Cisco Unified Border Element (UBE) is a local gateway that connects the PSTN to the Webex calling service. The UBE uses UDP port 5062 for SIP signaling only between itself and the PSTN, not between itself and the Webex calling service. Therefore, opening UDP port 5062 on the firewall will not help Alice to reach Charlie using Webex calling.

You can find more information about Cisco Webex calling and Cisco Unified Border Element here:

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/12_5_1/systemConfig/cucm_b_system-configuration-guide-1251/cucm_b_system-configuration-guide-1251_chapter_0100110.html

https://www.cisco.com/c/en/us/products/unified-communications/webex-calling/index.html

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asked 10/10/2024
Ramzi Smair
36 questions
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