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Share some CCIE 400-051 exam questions and answers below.
Which three issues prevent a customer from seeing the presence status of a new contact in their Jabber contact list? (Choose three.) 
A. incoming calling search space on SIP trunk to IM&P 
B. IM&P incoming ACL blocking inbound status 
C. subscribe calling search space on SIP trunk to IM&P 
D. PC cannot resolve the FQDN of IM&P 
E. Owner user ID is not set on device. 
F. Primary DN is not set in end user configuration for that user. 
G. Subscriber calling search space is not defined on user's phone. 
Answer: B,C,D

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 

Refer to the exhibit. 



A CUBE Cluster is working in HSRP box-to-box failover model. When the phone A calls Cisco WebEx meeting server to start a conference session, no DTMF tones are recognized. 
Which configuration change will fix this problem when configured on both CUBEs? 
A. Voice-class sip asymmetric payload dtmf in dial-peer configuration 
B. Dtmf-relay rtp-nte digitdrop in the dial-peer configuration 
C. Media flow-around under voice service voip configuration 
D. Modem relay nse payload-type101 underglobal sip configuration 
E. Asymmetric payload full configured under global sip configuration 
Answer: E 

What is the maximum number of option 150 IP addresses that a Cisco IP SCCP phone will accept and use from a DHCP server? 
A. 1 
B. 2 
C. 3 
D. 4 
E. 5 
Answer: B

What is the maximum number of option 66 IP addresses that a Cisco IP SCCP phone will accept and use from a DHCP server? 
A. 1 
B. 2 
C. 3 
D. 4 
E. 5 
Answer: B

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