CCIE voice exam quick reference sheets

182 Pages·2007·2.082 MB·English

by  Mark Lewis, CCIE

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[ 3]
CCIE Voice Exam Quick Reference Sheets: Exam 350-030 by Mark Lewis
Introduction
CCIE remains the preeminent vendor certification for network professionals.
The CCIE Voice track was announced in 2003,and more than 800 candidates took the beta-test written exam. This figure
was a record number for a CCIE track (surpassing all other tracks,including R&S,Service Provider,Security,and so on).
Since then,the CCIE Voice track has grown in popularity:The number of respondents to the Cisco 2006 CCIE Customer
Feedback survey intending to certify in the Voice track now equals the number of respondents intending to certify in the
R&S and Security tracks. Furthermore,among those already certified,interest in CCIE Voice now outranks interest in all
other tracks,including CCIE Security.
This CCIE Voice Written Exam (350-030) Quick Reference Sheets provides a one-stop,concise,and easy-to-read review
of all CCIE Voice written exam objectives.
Audience
The audience for these Quick Reference Sheets (QRS) will be candidates who are preparing for the CCIE Voice written
exam (350-030).
Scope
This QRS covers all the objectives for exam 350-030,including Cisco CallManager,quality of service (QoS),telephony
protocols,Cisco Unity,IOS telephony skills,IP Interactive Voice Response (IVR),IP Contact Center (IPCC) Express,
security,infrastructure protocols,applications protocols,and operations and management.
© 2007 Cisco Systems Inc. All rights reserved. This publication is protected by copyright.Please see page 185 for more details.
CCIE Voice Exam Quick Reference Sheets
CCIE Voice Exam Quick Reference Sheets By Mark Lewis ISBN: 9781587053337 Prepared for Tran Huong, Safari ID: [email protected]
Publisher: Cisco Press Licensed by Tran Huong
Print Publication Date: 2007/05/14 User number: 999108 Copyright 2007, Safari Books Online, LLC.
This PDF is exclusively for your use in accordance with the Safari Terms of Service. No part of it may be reproduced or transmitted in any form by any means without the prior
written permission for reprints and excerpts from the publisher. Redistribution or other use that violates the fair use priviledge under U.S. copyright laws (see 17 USC107) or that
otherwise violates the Safari Terms of Service is strictly prohibited.
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[ 4]
CHAPTER 1 CCIE Voice Exam Quick Reference Sheets: Exam 350-030 by Mark Lewis
Cisco CallManager
Cisco CallManager
Cisco CallManager is an IP telephony call-processing solution. It provides distributed,scalable enterprise call processing
and IP telephony features for IP phones,Voice over IP (VoIP) gateways,and multimedia applications and devices.
CallManager can be deployed using several different models,as shown in Figure 1-1:
n Single site:In this model,CallManager provides call processing at a single site,with no telephony being imple-
mented over an IP WAN.
n Multisite WAN with centralized call processing:In this case,CallManager is deployed at a central site,and it
provides call processing for a number of sites,with VoIP/IP telephony traffic being carried over an IP WAN between
sites.
n Multisite WAN with distributed call processing:When using this model,call-processing agents such as
CallManager are deployed at multiple sites,with VoIP/IP telephony traffic being transported over an IP WAN
between sites.
Several best practices are associated with these three different types of deployment model.
Best practices for the single-site model include the following:
n The single-site model is suited to enterprises where most calls are made to destinations within the same site or to the
PSTN.
n Deploy a highly available network infrastructure,with inline power,QoS,and security for phones.
n Use the Media Gateway Control Protocol (MGCP) between CallManager and voice gateways (assuming H.323 func-
tionality is not required).
n Use the G.711 codec.
© 2007 Cisco Systems Inc. All rights reserved. This publication is protected by copyright.Please see page 185 for more details.
CCIE Voice Exam Quick Reference Sheets
CCIE Voice Exam Quick Reference Sheets By Mark Lewis ISBN: 9781587053337 Prepared for Tran Huong, Safari ID: [email protected]
Publisher: Cisco Press Licensed by Tran Huong
Print Publication Date: 2007/05/14 User number: 999108 Copyright 2007, Safari Books Online, LLC.
This PDF is exclusively for your use in accordance with the Safari Terms of Service. No part of it may be reproduced or transmitted in any form by any means without the prior
written permission for reprints and excerpts from the publisher. Redistribution or other use that violates the fair use priviledge under U.S. copyright laws (see 17 USC107) or that
otherwise violates the Safari Terms of Service is strictly prohibited.
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CHAPTER 1 CCIE Voice Exam Quick Reference Sheets: Exam 350-030 by Mark Lewis
Cisco CallManager
FIGURE 1-1 Single Site Multisite WAN with Multisite WAN with
CallManager Centralized Call Processing Distributed Call Processing
deployment
models.
Cisco Cisco
CallManager CallManager
Central Central
Site Site
PSTN
V V
CallCMisacnoager PSTN WAN PSTN WAN
SRST SRST Cisco Cisco
V CallManager CallManager
V V V V
Remote Site Remote Site Remote Site Remote Site
Best practices for the multisite WAN with centralized call-processing model include the following:
n Consider factors that typically motivate the decision to deploy this model (or the multisite WAN with distributed call
processing model),including WAN bandwidth,delay limitations,scalability,management,cost,features,and so on.
n Use CallManager Locations for call admission control (CAC).
© 2007 Cisco Systems Inc. All rights reserved. This publication is protected by copyright.Please see page 185 for more details.
CCIE Voice Exam Quick Reference Sheets
CCIE Voice Exam Quick Reference Sheets By Mark Lewis ISBN: 9781587053337 Prepared for Tran Huong, Safari ID: [email protected]
Publisher: Cisco Press Licensed by Tran Huong
Print Publication Date: 2007/05/14 User number: 999108 Copyright 2007, Safari Books Online, LLC.
This PDF is exclusively for your use in accordance with the Safari Terms of Service. No part of it may be reproduced or transmitted in any form by any means without the prior
written permission for reprints and excerpts from the publisher. Redistribution or other use that violates the fair use priviledge under U.S. copyright laws (see 17 USC107) or that
otherwise violates the Safari Terms of Service is strictly prohibited.
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CHAPTER 1 CCIE Voice Exam Quick Reference Sheets: Exam 350-030 by Mark Lewis
Cisco CallManager
n Consider deploying Survivable Remote Site Telephony (SRST).
n Minimize delay between CallManager and remote sites as much as possible.
Best practices for the multisite WAN with distributed call-processing model include the following:
n Follow general guidelines for the single-site and multisite WAN with centralized call-processing models,in addition
to other specific best practices for this model.
n Use H.323 gatekeepers for CAC and dial-plan resolution. Alternatively,use SIP proxies for dial-plan resolution.
n Ensure high availability for gatekeepers by using mechanisms such as HSRP gatekeeper pairs,gatekeeper clustering,
and redundancy using multiple gatekeepers. Similarly,if you are using SIP proxies,ensure that there is redundancy
for these devices.
n Select one (low-bandwidth) codec (only) for use on the WAN.
During (at least) the initial deployment phase for CallManager,CallManager commonly must coexist with a traditional
PBX infrastructure.
There are two common approaches to migration from a PBX infrastructure to IP telephony:
n Phased migration:In this case,there is a small initial IP telephony deployment,and connectivity between
CallManager and the PBX is provided via a VoIP gateway,using T1/E1 CAS/analog or T1/E1 PRI.
The signaling protocol chosen for connectivity can include regular PRI,QSIG PRI,SIP,or H.323. QSIG allows the
greatest level of feature transparency between CallManager and PBX.
The migration itself takes place in several phases,with users being gradually moved over from the PBX to
CallManager.
© 2007 Cisco Systems Inc. All rights reserved. This publication is protected by copyright.Please see page 185 for more details.
CCIE Voice Exam Quick Reference Sheets
CCIE Voice Exam Quick Reference Sheets By Mark Lewis ISBN: 9781587053337 Prepared for Tran Huong, Safari ID: [email protected]
Publisher: Cisco Press Licensed by Tran Huong
Print Publication Date: 2007/05/14 User number: 999108 Copyright 2007, Safari Books Online, LLC.
This PDF is exclusively for your use in accordance with the Safari Terms of Service. No part of it may be reproduced or transmitted in any form by any means without the prior
written permission for reprints and excerpts from the publisher. Redistribution or other use that violates the fair use priviledge under U.S. copyright laws (see 17 USC107) or that
otherwise violates the Safari Terms of Service is strictly prohibited.
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CHAPTER 1 CCIE Voice Exam Quick Reference Sheets: Exam 350-030 by Mark Lewis
Cisco CallManager
n Parallel cutover:This migration approach involves the deployment of a complete,parallel IP telephony infrastruc-
ture,including the placement of a second (IP) phone on each user’s desk. The legacy PBX and infrastructure can be
left in place until the IP telephony infrastructure is proven to operate correctly,and users have developed a high
degree of confidence in it.
Codecs and Regions
In a VoIP network,calls typically will have to transit both LAN links,where bandwidth is usually abundant,and WAN
links,where it usually is not. Different codecs often have different associated bandwidth requirements,and in Cisco
CallManager,it is possible to specify which type of codec should be used when voice traffic transit links between differ-
ent parts of the network using a mechanism called Regions.
One method of implementing CAC with CallManager is to use Locations. Locations CAC is dependent on Regions
because Regions are used to control the particular codec and the amount of bandwidth that needs to be allocated for a call
when voice traffic crosses the network. Locations CAC is described in the section titled “Call Admission Control,”later
in this e-book.
As shown in Figure 1-2,you can configure and modify Regions within CallManager Administration by navigating to
System>Region.
You use Regions to specify the codec and maximum video bandwidth that can be used on calls between devices. Every
device is in a Region,and you assign a device to a Region by specifying a Region within a device pool,and then assign-
ing the device pool to a device.
The default codec for audio calls is G.711,so if this is the only codec used in a network,it is not necessary to configure
Regions.
© 2007 Cisco Systems Inc. All rights reserved. This publication is protected by copyright.Please see page 185 for more details.
CCIE Voice Exam Quick Reference Sheets
CCIE Voice Exam Quick Reference Sheets By Mark Lewis ISBN: 9781587053337 Prepared for Tran Huong, Safari ID: [email protected]
Publisher: Cisco Press Licensed by Tran Huong
Print Publication Date: 2007/05/14 User number: 999108 Copyright 2007, Safari Books Online, LLC.
This PDF is exclusively for your use in accordance with the Safari Terms of Service. No part of it may be reproduced or transmitted in any form by any means without the prior
written permission for reprints and excerpts from the publisher. Redistribution or other use that violates the fair use priviledge under U.S. copyright laws (see 17 USC107) or that
otherwise violates the Safari Terms of Service is strictly prohibited.
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CHAPTER 1 CCIE Voice Exam Quick Reference Sheets: Exam 350-030 by Mark Lewis
Cisco CallManager
FIGURE 1-2
Configuration of
Regions.
Redundancy: CallManager Groups and Device Pools
Two methods of configuring call-processing redundancy in Cisco CallManager deployments are CallManager groups and
device pools. These concepts are explored further in this section.
© 2007 Cisco Systems Inc. All rights reserved. This publication is protected by copyright.Please see page 185 for more details.
CCIE Voice Exam Quick Reference Sheets
CCIE Voice Exam Quick Reference Sheets By Mark Lewis ISBN: 9781587053337 Prepared for Tran Huong, Safari ID: [email protected]
Publisher: Cisco Press Licensed by Tran Huong
Print Publication Date: 2007/05/14 User number: 999108 Copyright 2007, Safari Books Online, LLC.
This PDF is exclusively for your use in accordance with the Safari Terms of Service. No part of it may be reproduced or transmitted in any form by any means without the prior
written permission for reprints and excerpts from the publisher. Redistribution or other use that violates the fair use priviledge under U.S. copyright laws (see 17 USC107) or that
otherwise violates the Safari Terms of Service is strictly prohibited.
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CHAPTER 1 CCIE Voice Exam Quick Reference Sheets: Exam 350-030 by Mark Lewis
Cisco CallManager
Cisco CallManager Groups
Cisco CallManager groups can be used to specify a prioritized list of up to three CallManagers with which Cisco IP
phones can register. It is possible for a CallManager server to be in more than one group.
The operation of the CallManager group is straightforward:During initialization,Cisco IP phones download a configura-
tion file from a TFTP server,and this configuration file contains the prioritized list of CallManagers.
Cisco IP phones will first attempt to register with the primary CallManager in the list,and if this fails,they will attempt
to register with the secondary CallManager. Finally,they will attempt to register with the tertiary CallManager.
During normal operation,if a CallManager fails,Cisco IP phones will failover to (reregister with) the secondary/tertiary
CallManagers in the group. Active calls are preserved,and Cisco IP phones reregister when existing calls are complete.
CallManager groups are associated with devices via a device pool. (Each device pool has an associated CallManager
group,and each device is associated with a device pool.)
You can configure CallManager groups with Cisco CallManager Administration by navigating to System>Cisco
CallManager Group. Figure 1-3 shows the configuration of a CallManager group.
Note that the Auto-registration Cisco CallManager Group checkbox is used to ensure that Cisco IP phones that autoregis-
ter will receive the CallManager group assignment shown. Only one CallManager group can be used for autoregistration
per cluster.
If a CallManager group is associated with a device pool,or if a CallManager group is used for autoregistration,it cannot
be deleted.
© 2007 Cisco Systems Inc. All rights reserved. This publication is protected by copyright.Please see page 185 for more details.
CCIE Voice Exam Quick Reference Sheets
CCIE Voice Exam Quick Reference Sheets By Mark Lewis ISBN: 9781587053337 Prepared for Tran Huong, Safari ID: [email protected]
Publisher: Cisco Press Licensed by Tran Huong
Print Publication Date: 2007/05/14 User number: 999108 Copyright 2007, Safari Books Online, LLC.
This PDF is exclusively for your use in accordance with the Safari Terms of Service. No part of it may be reproduced or transmitted in any form by any means without the prior
written permission for reprints and excerpts from the publisher. Redistribution or other use that violates the fair use priviledge under U.S. copyright laws (see 17 USC107) or that
otherwise violates the Safari Terms of Service is strictly prohibited.
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CHAPTER 1 CCIE Voice Exam Quick Reference Sheets: Exam 350-030 by Mark Lewis
Cisco CallManager
FIGURE 1-3
Configuration of a
Cisco CallManager
group.
Device Pools
A device pool is a simple method of configuring the same parameters for a set of devices,such as Cisco IP phones. So,if
you want to apply the same parameters for several Cisco IP phones,it is typically much easier to use a device pool to do
this than to assign those parameters to each phone individually. Once you assign a device to a device pool,it inherits
those parameters configured for the device pool.
© 2007 Cisco Systems Inc. All rights reserved. This publication is protected by copyright.Please see page 185 for more details.
CCIE Voice Exam Quick Reference Sheets
CCIE Voice Exam Quick Reference Sheets By Mark Lewis ISBN: 9781587053337 Prepared for Tran Huong, Safari ID: [email protected]
Publisher: Cisco Press Licensed by Tran Huong
Print Publication Date: 2007/05/14 User number: 999108 Copyright 2007, Safari Books Online, LLC.
This PDF is exclusively for your use in accordance with the Safari Terms of Service. No part of it may be reproduced or transmitted in any form by any means without the prior
written permission for reprints and excerpts from the publisher. Redistribution or other use that violates the fair use priviledge under U.S. copyright laws (see 17 USC107) or that
otherwise violates the Safari Terms of Service is strictly prohibited.
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CHAPTER 1 CCIE Voice Exam Quick Reference Sheets: Exam 350-030 by Mark Lewis
Cisco CallManager
You can configure device pools within Cisco CallManager Administration by navigating to System>Device Pool.
Figure 1-4 shows the configuration of a device pool.
FIGURE 1-4
Configuration of
a device pool.
© 2007 Cisco Systems Inc. All rights reserved. This publication is protected by copyright.Please see page 185 for more details.
CCIE Voice Exam Quick Reference Sheets
CCIE Voice Exam Quick Reference Sheets By Mark Lewis ISBN: 9781587053337 Prepared for Tran Huong, Safari ID: [email protected]
Publisher: Cisco Press Licensed by Tran Huong
Print Publication Date: 2007/05/14 User number: 999108 Copyright 2007, Safari Books Online, LLC.
This PDF is exclusively for your use in accordance with the Safari Terms of Service. No part of it may be reproduced or transmitted in any form by any means without the prior
written permission for reprints and excerpts from the publisher. Redistribution or other use that violates the fair use priviledge under U.S. copyright laws (see 17 USC107) or that
otherwise violates the Safari Terms of Service is strictly prohibited.
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CHAPTER 1 CCIE Voice Exam Quick Reference Sheets: Exam 350-030 by Mark Lewis
Cisco CallManager
Fourteen individual parameters can be configured within a Device Pool,including the following:
n Device Pool Name:The name of the device pool.
n Cisco CallManager Group:A prioritized list of CallManagers.
n Date/Time Group:Specifies the time zone in which a device is located.
n Region:Defines the codecs used when traffic transits between different parts of the network.
n Softkey Template:Determines the function of softkeys associated with a phone.
n Survivable Remote Site Telephony (SRST) Reference:The device with which phones should register if they are
unable to communicate with CallManager.
n Calling Search Space for Auto-Registration:Defines calling restrictions for phones that autoregister with
CallManager.
n Media Resource Group List:Media resources,such as transcoding and conferencing resources,that are available
to a device.
n Network Hold MoH Audio Source:Music audio that a device user hears when,for example,his call is transferred.
n User Hold MoH Audio Source:Music audio that a device user hears when he presses the Hold button on a phone.
n Network Locale:Specifies the tones and cadences associated with a device.
n User Locale:Defines the language and fonts associated with a device.
n Connection Monitor Duration:The length of time before a phone that is using SRST fails back to a CallManager
after it has become available again.
n MLPP Indication:Multi-Level Precedence and Preemption (MLPP) indication specifies whether a tone will be
played when a device makes or receives a precedence call.
© 2007 Cisco Systems Inc. All rights reserved. This publication is protected by copyright.Please see page 185 for more details.
CCIE Voice Exam Quick Reference Sheets
CCIE Voice Exam Quick Reference Sheets By Mark Lewis ISBN: 9781587053337 Prepared for Tran Huong, Safari ID: [email protected]
Publisher: Cisco Press Licensed by Tran Huong
Print Publication Date: 2007/05/14 User number: 999108 Copyright 2007, Safari Books Online, LLC.
This PDF is exclusively for your use in accordance with the Safari Terms of Service. No part of it may be reproduced or transmitted in any form by any means without the prior
written permission for reprints and excerpts from the publisher. Redistribution or other use that violates the fair use priviledge under U.S. copyright laws (see 17 USC107) or that
otherwise violates the Safari Terms of Service is strictly prohibited.