Latest CCNP Voice 642-457 Dumps (1-5)

QUESTION 1
Which two features require or may require configuring a SIP trunk? (Choose two.)
A.    SIP gateway
B.    Call Control Discovery between a Cisco Unified Communications Manager and Cisco Unified Communications Manager Express
C.    Cisco Device Mobility
D.    Cisco Unified Mobility
E.    registering a SIP phone
Answer: AD

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