Threats Targeting the IP Telephony System

The main threats targeting the IP telephony system are as follows:

  • Loss of privacy If calls can be sniffed, conversations can be replayed or eavesdropped. Because of the open nature of IP networks and, especially, the low trust level in the Internet, privacy is a commonly raised concern when comparing IP telephony solutions against traditional telephony solutions.
  • Loss of integrity If voice call signaling or media messages can be intercepted, they can be modified. Although this issue might not arise for human conversations very often, do not forget that calls such as telebanking, e-mail or voice-mail access over a telephone, and similar applications using interactive voice response (IVR) might require secure communication.
  • Impersonation Identity spoofing is not limited to humans (for instance, the person behind a telephone) but can also extend to devices, such as Cisco CallManager, a voice gateway, or an IP phone.
  • Denial of Service (DoS) These attacks cause loss of functionality. They can be directed against IP telephony components, such as voice gateways, Cisco CallManager nodes, or IP phones, or against the underlying infrastructure. An example is replacing IP phone configuration files or images stored on a TFTP server with invalid files that cause the IP phone to malfunction.

How CallManager Protects Against Threats

Part I: Cisco CallManager Fundamentals

Introduction to Cisco Unified Communications and Cisco Unified CallManager

Cisco Unified CallManager Clustering and Deployment Options

Cisco Unified CallManager Installation and Upgrades

Part II: IPT Devices and Users

Cisco IP Phones and Other User Devices

Configuring Cisco Unified CallManager to Support IP Phones

Cisco IP Telephony Users

Cisco Bulk Administration Tool

Part III: IPT Network Integration and Route Plan

Cisco Catalyst Switches

Configuring Cisco Gateways and Trunks

Cisco Unified CallManager Route Plan Basics

Cisco Unified CallManager Advanced Route Plans

Configuring Hunt Groups and Call Coverage

Implementing Telephony Call Restrictions and Control

Implementing Multiple-Site Deployments

Part IV: VoIP Features

Media Resources

Configuring User Features, Part 1

Configuring User Features, Part 2

Configuring Cisco Unified CallManager Attendant Console

Configuring Cisco IP Manager Assistant

Part V: IPT Security

Securing the Windows Operating System

Securing Cisco Unified CallManager Administration

Preventing Toll Fraud

Hardening the IP Phone

Understanding Cryptographic Fundamentals

Understanding the Public Key Infrastructure

Understanding Cisco IP Telephony Authentication and Encryption Fundamentals

Configuring Cisco IP Telephony Authentication and Encryption

Part VI: IP Video

Introducing IP Video Telephony

Configuring Cisco VT Advantage

Part VII: IPT Management

Introducing Database Tools and Cisco Unified CallManager Serviceability

Monitoring Performance

Configuring Alarms and Traces

Configuring CAR

Using Additional Management and Monitoring Tools

Part VIII: Appendix

Appendix A. Answers to Review Questions


Authorized Self-Study Guide Cisco IP Telephony (CIPT)
Cisco IP Telephony (CIPT) (Authorized Self-Study) (2nd Edition)
ISBN: 158705261X
EAN: 2147483647
Year: 2004
Pages: 329 © 2008-2020.
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