Chapter 2 - Understanding the Components of Cisco Unified Communications

Question 1

Cisco Unified Communications Manager (CUCM)

Answer 1

The multiserver call processing platform that is able to support up to 30,000 users per cluster.

Question 2

Cisco Unified Communications Manager Express (CME)

Answer 2

The call processing platform that is able to support up to 250 users (depending on router hardware)

Question 3

Cisco Unity Connection

Answer 3

The single-server unified messaging platform that is capable of supporting up to 7,500 users

Question 4

Cisco Unified Presence

Answer 4

Provides status and reachability information for the users of the voice network

Question 5

Automatic Call Distribution (ACD)

Answer 5

A device or service that automatically reroutes calls to customers in geographically distributed locations served by the same central office (CO)

Question 6

Skinny Client Control Protocol (SCCP)

Answer 6

Cisco proprietary voice-signaling protocol used to control Cisco IP phones

Question 7

Session Initiation Protocol (SIP)

Answer 7

Voice-signaling protocol created by the IETF as a lightweight alternative to H.323

Question 8

Realtime Transport Protocol (RTP)

Answer 8

The UDP-based protocol responsible for transporting audio packets; uses random, even-numbered ports from 16,384 to 32,767 for communications

Question 9

Internet Telephony Service Provider (ITSP)

Answer 9

Provides VOIP trunk connectivity to the PSTN to provide a cost savings over traditional telephony service provider (TSP).

Question 10

Digital Signal Processor (DSP)

Answer 10

A chip that performs all the sampling, encoding, and compression functions on audio (and, in current hardware, video, too) coming into your router.

Question 11

Cisco Unity Express (CUE)

Answer 11

The unified messaging platform that is integrated into a Cisco Unified CME router; capable of supporting up to 250 users

Question 12

Interactive Voice Response (IVR)

Answer 12

An automated system that provides a recorded, automated process to callers accessing your voice network

Question 13

CUCM Publisher

Answer 13

CUCM server that maintains the only writable copy of the database and serves TFTP requests

Question 14

CUCM Subscriber

Answer 14

CUCM servers (up to 19) that maintain read-only copies of the database. Up to 8 can be call-processing servers, the rest perform dedicated roles such as TFTP server, conference bridges, music on hold, or annunciator servers.

Question 15

Intracluster Communication Signaling (ICCS)

Answer 15

Method for communicating between all Cisco Unified servers in the voice network

Question 16

Voice Profile for Internet Mail (VPIM)

Answer 16

A feature that allows one voicemail system to exchange messages with another voicemail system

Question 17

Cisco Unified Personal Communicator

Answer 17

Cisco Unified Personal Communicator is a multimedia application that provides instant access from your desktop to integrated audio calls, enterprise instant messaging, visual voicemail, your corporate directory, video, and web conferencing. Cisco Unified Personal Communicator delivers an intuitive user interface, wide-band audio, and high-definition video.

Question 18

CUCM Key Features

Answer 18

1) Full support for audio and video telephony, 2) Appliance-based operation, 3) VMware installation, 4) Redundant server cluster, 5) Intercluster and voice gateway control and communication, 6) Built-in disaster recovery system (DRS), 7) Directory service support or integration

Question 19

CUCM Publisher & Subscriber roles & relationships

Answer 19

1) Informix DB, 2) 1-way push, 3) Publisher holds master copy of DB, 4) changes are implemented on the Publisher, 5) change replicated from the Publisher to the Subscriber(s)

Question 20

Difference between a primary CUCM server and the Publisher server

Answer 20

1) Publisher maintains writable copy of the DB, 2) Primary CUCM server receives off-hook message and responds accordingly

Question 21

CUC maximum mailbox count

Answer 21

20,000 mailboxes maximum whether on standalone or Active-Active server pair

Question 22

Method used to route incoming calls to CUC server from CUCM

Answer 22

1) Incoming call from PSTN arrives at voice gateway; voice gateway routes call to CUCM, 2) CUCM receives the call and directs it to the appropriate IP phone; if no answer, directs call to CUC, 3) CUCM transfers call to CUC; extension of originally called phone is contained in signaling messages

Question 23

CME capactity and platform

Answer 23

Max 450 phones; Runs on ISR router

Question 24

CUCM capacity and platform

Answer 24

Max 40,000 phones per cluster; Runs on UCS/VMware appliance platform

Question 25

IMP capacity and platform

Answer 25

Max 45,000 users with CUCM cluster integration; Runs on UCS / WMwad platform

Question 26

CUC capacity and platform

Answer 26

Max 20,000 mailboxes; Runs on UCS / WmWare wppleance