Cisco Collaboration Cloud and Edge Solutions: Implementing Cisco Media Traversal Technology

Expressway-C and Expressway-E Communication: Secure Environment for Internal and External Video Endpoints

Prev Question Next Question

Question

Cisco media traversal technology has enabled a secure environment where internal video endpoints call and receive calls from external video endpoints.

How does the Expressway-C and Expressway-E communicate?

Answers

A. Expressway-C establishes an outgoing request to Expressway-E, enabling the Expressway-E in the DMZ to notify the internal Expressway-C of an incoming call from an external endpoint.

B. Internal endpoints are registered to Expressway-E in the DMZ. Expressway-C, which is also in the DMZ, will receive and make calls on behalf of Expressway- E because they are in the same network.

C. Expressway-E establishes an outgoing request to Expressway-C, enabling the Expressway-C in the DMZ to notify the internal Expressway-E of an incoming call from an external endpoint.

D. Internal endpoints are registered to Expressway-C in the DMZ. Expressway-E, which is also in the DMZ, will receive and make calls on behalf of Expressway- C because they are in the same network.

Show Answer

Explanations

Click on the arrows to vote for the correct answer

A. B. C. D.

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X12-5/exwy_b_mra-expressway-deployment-guide/exwy_b_mra-

Sure, I can provide you with a detailed explanation of how the Expressway-C and Expressway-E communicate in Cisco media traversal technology.

Expressway-C and Expressway-E are two components of the Cisco Collaboration Edge Architecture that provide secure communication between internal and external endpoints. Expressway-C is located inside the corporate network, while Expressway-E is located in the DMZ (Demilitarized Zone) outside the corporate network.

When an external video endpoint wants to call an internal video endpoint, it sends a call request to Expressway-E in the DMZ. Expressway-E authenticates and authorizes the call request, and then sends a notification to Expressway-C inside the corporate network. Expressway-C receives the notification and establishes a call with the internal video endpoint.

Similarly, when an internal video endpoint wants to call an external video endpoint, Expressway-C sends the call request to Expressway-E in the DMZ. Expressway-E authenticates and authorizes the call request, and then sends a notification to the external video endpoint. Once the external endpoint acknowledges the call request, Expressway-E establishes a call with the internal video endpoint.

So, to answer the question, the correct answer is A: Expressway-C establishes an outgoing request to Expressway-E, enabling the Expressway-E in the DMZ to notify the internal Expressway-C of an incoming call from an external endpoint. This is because Expressway-C initiates the communication with Expressway-E in both cases of incoming and outgoing calls, and Expressway-E responds by sending notifications to the appropriate endpoint.

Option B is incorrect because it suggests that internal endpoints are registered to Expressway-E in the DMZ, which is not the case. Option C is also incorrect because it suggests that Expressway-E initiates the communication with Expressway-C, which is not the case either. Option D is incorrect for the same reason as option B.

I hope this explanation helps you understand how Expressway-C and Expressway-E communicate in Cisco media traversal technology.

Prev Question Next Question