Learn About Implementing Cisco IOS Unified Communications

These questions are based on 640-460: Implementing Cisco IOS Unified Communications
A Self Test Software Practice Test

Objective: Describe the components of the Cisco Unified Communications Architecture.
Sub-objective: Describe the function of endpoints in a UC environment.

Single answer, multiple-choice

Which protocol is supported by Cisco IP phones and Cisco gateways operating at the endpoints layer of the Cisco Unified Communications system?

A.    RTP
B.    MGCP
C.    SCCP
D.    G.711

Answer:
C

Tutorial:
Skinny Call Control Protocol (SCCP) is a Cisco protocol used for communication between IP phones or gateways and Cisco Unified Communications Manager. It follows the server/client model, in which the main control and processing is done by the Unified Communications Manager, which is the central call-control unit. Any device, software or application that connects to the network and directly interacts with the end user will come under the endpoints layer. Other products that function as endpoints are wireless phones, video phones, analog phones, cell phones, PCs and instant messenger clients.

There are four layers to the Cisco Unified Communications system: the infrastructure layer, the endpoints layer, the applications layer and the call processing layer. All of these layers and their functionalities complete a VoIP structure.

Real-Time Transport Protocol (RTP) is a standardized packet format for delivering real-time traffic such as audio and video.

Media Gateway Control Protocol (MGCP) is used for communication with gateways. It is not used for communicating with IP phones.

G.711 is a codec used in Cisco Unified Communications.…


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