Quiz and Chapter Download

Voice over IP security: Cisco Unified CallManager

Do you think you know how to secure your customer's Cisco Unified CallManager (CCM) against voice over IP (VoIP) hackers? Take this quiz to test your practical knowledge.

True or False?


  1. Cisco Unified CallManager 5.x runs on an MCS.

  2. Skinny Client Control Protocol (SCCP) or "Skinny" is the name of Cisco's proprietary signaling protocol.

  3. By itself and disconnected from the CallManager, a Cisco IP phone cannot play a dial tone.

  4. There is no easy way to disable the Web management interface from Cisco's CallManager interface.

  5. In a VoIP environment, you should always turn off Cisco Discovery Protocol (CDP) to prevent inside sniffing.

  6. When Dynamic Host Configuration Protocol (DCHP) snooping is enabled, the Cisco switch can prevent a spoofed DCHP server from assigning IP addresses.

  7. Configuring your switches and routers with the proper ingress and egress filtering rules must be done manually.

  8. The Virtual Network Computing (VNC) program should remain enabled after use with CallManager because it contains a built-in control that limits access from within the network.

  9. A Cisco-specific countermeasure for mitigating flooding attacks is to ensure that quality of service (QoS) settings are properly configured, and

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  1. Cisco provides this in a step-by-step guide.

  2. Services enabled by default on the IP phone should always remain enabled for the highest level of security.


How did you do? Could you stand to learn a bit more about preventing hack attacks on your customer's CCM?

Download Chapter 7, Cisco Unified CallManager, from Hacking Exposed VoIP: Voice Over IP Security Secrets & Solutions written by David Endler and Mark Collier and published by McGraw-Hill Professional.


Hacking Exposed VoIP: Voice Over IP Security Secrets & Solutions
By David Endler and Mark Collier
Published by McGraw-Hill
ISBN-10: 0072263644; ISBN-13: 9780072263640; Published: November 28, 2006; Copyright 2007; Pages: 539; Edition: 1st.

This was first published in February 2007

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