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With these security capabilities and the many other capabilities that Cisco provides, users can protect their IP Communications systems at all levels. The transport infrastructure, the call-control systems, the endpoints, and even the applications can be secured with the broadest range of solutions available anywhere. A broad, integrated approach is essential to securing both data and voice. While no security program can claim to be completely infallible, careful adherence to the SAFE Blueprint guidelines will make a Cisco IP Communications systems as safe as it can be. Cisco's leadership and expertise in network security solutions make its solutions unique in their ability to protect IP telephony and VoIP. For more information about Cisco security solutions, visit: http://www.clsco.com/go/securiry For more information about Cisco IP Communications security solutions, visit: htrp:llwww..:isco.com/gnlip.:security ACCESSIBILITY Cisco is committed to providing accessible and usable solutions to improve the way all people work, live, play, and learn. The Cisco IP Communications platform conforms to Section 508 of the Rehabilitation Act and Section 255 of the Telecommunications Act, which protect the rights of people with disabilities by encouraging organizations and manufacturers to provide telecommunications and IT resources that everyone can use. As a result, Cisco customers are able to fully realize the value of their diverse workforces. As the global leader in network communications, Cisco devotes extensive resources to helping to ensure the accessibility of its IP Communications solutions, including a dedicated accessibility team staffed with experts. And because Cisco is its own most demanding customer, its own employees with disabilities use Cisco products in their daily work, providing immediate, relevant feedback to designers about accessibility and usability. Cisco's commitment to accessibility extends beyond the company walls, as well. Cisco participates actively in standards committees and industry boards, and collaborates closely with consultants, universities, interest groups, and experts who specialize in accessibility. To better understand the needs and concerns of people with disabilities and to validate its designs. Cisco engages people with disabilities for focus groups and usability studies. Many of their suggestions have become standard features in Cisco IP Communications products. . For more information about the accessibility of Cisco IP Communications solutions, visit: hrtp:llwww.ciscn.com/w\vllr(.gafbirs! 'lcccssi hi Ii tr_s ta nd'lrds/ QoS As a class of IP network traffic, voice has strict requirements concerning packet loss, delay, and delay variation (also known as jitter). To meet these requirements for voice traffic, the Cisco IP Communications system includes QoS features such as classification, queuing, traffic shaping, Compressed Real-Time Transport Protocol (CRTP), and TCP header compression. The QoS compolleQts of the Cisco IP Communications system are provided through the rich IP traffic management. queuing, and shaping capabilities of the Cisco AVVID network infrastructure. Elements of this infrastructure that enable QoS for IP Communications include: · Traffic marking · Enhanced queuing services in Cisco Catalyst switches · Link fragmentation and interleaving (LFI) · CRTP · Low-latency queuing (LLQ) · Link efficiency · Traffic shaping · Call admission control 13