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Share some CCIE 400-051 exam questions and answers below.
Refer to the exhibit. 



A user is on an outbound call through a Cisco Unified border Element gateway. When the user places the call on hold, the remote party hears silence. The Cisco Unified Communication Manager Cluster is using multicast on hold. The Cisco Unified Border Element Gateway is on the same subnet as the Cisco Unified Communication Manager Cluster. 
Which two options will resolve this issue? (Choose two) 
A. Media flow-through must be configured. 
B. CCM-manager music-on-hold should be removed from the configuration. 
C. The session transport UDP command must be configured. 
D. The Cisco unified border Element router must be set up for gateway-based MOH. 
E. The pass-thru content sdp command should be removed. 
Answer: AE 

Which two Cisco Unified Communications Manager Express hunt group mechanisms keep track of the number of hops in call delivery decisions? (Choose two.) 
A. sequential 
B. peer 
C. longest idle 
D. parallel 
E. overlay 
F. linear 
Answer: BC

A collaboration engineer has been asked to implement secure real-time protocol between a Cisco Unified CM and SIP gateway. 
Which option is a consideration for this implementation? 
A. Only T.38 and Cisco fax protocol are supported 
B. SIP require the all the time be sent in GMT 
C. Call hold RE-INVITE is not supported 
D. SRTP is supported only in cisco IOS 15.x and higher 
Answer: B 

Which two guidelines are recommended when configuring agent phones for Cisco Unified CCX agents? (Choose two.) 
A. In the Multiple Call/Call Waiting Settings section, set the Maximum Number of Calls to 2. 
B. In the Multiple Call/Call Waiting Settings section, set the Busy Trigger value to 2. 
C. The Unified CCX extension for the agent must be listed within the top four extensions on the device profile. 
D. In the Multiple Call/Call Waiting Settings section, set the Maximum Number of Calls to at least 3. 
E. Always enable SRTP when configuring an agent phone. 
Answer: AC 


Refer to the exhibit. 



A jabber user reports that desktop mode does not work. Connection status shows the following message "Connection error. Ensure the server information in the phone services tab on the option window is correct. contact your system administrator for assistance." 
Which two actions will resolve the problem? (Choose two) 
A. Change LDAP port from 389 to 636 in LDAP directory configuration 
B. Restart DirSync service under unified serviceability 
C. Change LDAP port from 389 to 443 in LDAP director configuration 
D. Change LDAP port from 389 to 3268 in LDAP director configuration 
E. Restart CTI manager service under unified serviceability 
F. Restart TFTP service under Unified serviceability 
Answer: DE

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