Cisco 300-820: Which configuration must happen enable the communication between two separate Expressway-C servers 

Question

An engineer must enable the communication between two separate Expressway-C servers to allow inbound and outbound calling between different endpoints registered on each server. Which configuration must happen?

A. Configure a traversal zone on each server with a destination of the other Expressway-C.
B. Configure a neighbor zone on each server with a destination of the other Expressway-C.
C. Configure a transform on each server to strip the port numbers at the end of the alias.
D. Configure a transform on each server to convert the calling alias into the called alias.

Answer

B. Configure a neighbor zone on each server with a destination of the other Expressway-C.

Explanation

The correct answer is B. Configure a neighbor zone on each server with a destination of the other Expressway-C.

A neighbor zone is a type of zone that allows two Expressway servers to communicate with each other and route calls between them. A neighbor zone can be used to connect two Expressway-C servers that are in the same network or in different networks. A neighbor zone can also be used to connect an Expressway-C server with an Expressway-E server, a Unified CM server, or a third-party SIP server.

To configure a neighbor zone on each Expressway-C server, the engineer must specify the following parameters:

• Zone name: A descriptive name for the zone, such as “Expressway-C-1 to Expressway-C-2”.
• Zone profile: The type of zone, which should be set to “Neighbor”.
• Peer address: The IP address or hostname of the other Expressway-C server.
• SIP port: The port number used for SIP signaling, which is usually 5060 for TCP or UDP, or 5061 for TLS.
• Transport: The transport protocol used for SIP signaling, which can be TCP, UDP, or TLS.
• SIP URI: The SIP URI of the other Expressway-C server, which is usually the same as the peer address.

The other options are incorrect because:

• A. Configure a traversal zone on each server with a destination of the other Expressway-C. This is false because a traversal zone is not used to connect two Expressway-C servers, but rather to connect an Expressway-C server with an Expressway-E server. A traversal zone allows an Expressway-C server to traverse firewalls and NAT devices and communicate with external endpoints through an Expressway-E server.
• C. Configure a transform on each server to strip the port numbers at the end of the alias. This is false because this is not necessary to enable communication between two Expressway-C servers. A transform is a rule that modifies the SIP headers or URIs of incoming or outgoing calls. A transform can be used to change the format, domain, or prefix of an alias, but not to strip the port numbers.
• D. Configure a transform on each server to convert the calling alias into the called alias. This is false because this is not necessary to enable communication between two Expressway-C servers. A transform can be used to change the alias of a call, but not to convert the calling alias into the called alias. This would result in a loop or an error, as the calling alias and the called alias would be the same.

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