Two sites are using a multisite centralized call processing model. The voice gateway on the remote branch has lost IP connectivity to its Cisco CallManager server. Which feature enables the remote gateway to take the role of the call agent during the WAN failure？（）

A.Use the command ip nbar protocol-discovery to allow identification of stateful protocols. Use the command ip nbar port-map to attach the protocols to an interface.
B.Use the command match protocol rtp to allow identification of real-time audio and video traffic. Use thecommand ip nbar port-map to extend the NBAR functionality for well-known protocols to new port numbers.
C.Use the command match protocol to allow identification of stateful protocols. Use the command ip nbar port-map to attach the protocols to an interface.
D.Configure a traffic class. Configure a traffic policy. Attach the traffic policy to an interface.
E.Configure video streaming. Configure audio streaming. Attach the codec to an interface.

A.5
B.15
C.25
D.35
E.45
F.55

A.Over leased lines，use the multilink ppp command to reduce latency and jitter，and to create Distributed Link Fragmentation and interleaving.
B.Use the service-policy command to attach a traffic flow to an interface on the router.
C.Use the ip rsvp bandwidth command to set a strict upper limit on the bandwidth NBAR uses，and toguarantee admission of any flows.
D.Use the policy-map command to define one or more QoS policies （such as shaping，policing，and so on） to apply to traffic defined by a class map.
E.Use the random-detect dscp command to modify the default minimum and maximum thresholds for the DSCP value.
F.Use the class-map command to define one or more traffic classes by specifying the criteria by which traffic is classified.