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Trong chương này, bạn sẽ mở rộng kiến thức của bạn duy nhất trang web của Chương 10 giải pháp VoIP vào một doanh nghiệp nhiều environment.We sẽ được thực hiện thiết kế mạng lưới chuyên ngành hướng tới giải pháp thiết kế functionality. | Cisco AVVID and IP Telephony Design Implementation Fast Track Appendix 443 Chapter 1 Continued Benefiting from Digital Systems 0 Digital signals are binary made up of on or off signals. 0 Digital signals can be compressed corrected and manipulated more easily than analog signals. 0 Amplification can occur in digital signals without amplifying background noise and static. Providing Video Services 0 Video services can demand the most real-time bandwidth in the network. 0 Video data is typically compressed to reduce its load on the network. 0 One-to-many video is a perfect application for IP multicast. Chapter 2 New World Technologies Introduction to IP Telephony 0 Simplified administration is achieved by converging three separate networks into one allowing one resource pool to administer the entire network. 0 Toll bypass allows organizations to avoid costly telecommunications expenses by utilizing the data infrastructure. 0 Unified messaging combines voice-mail e-mail and faxes into one easy-to-use interface. IP Telephony Components 0 CallManager provides the IP telephony network with a software-based PBX system. 0 IP telephones provide the user interface to the IP telephony network. 0 Gateways provide the interface between the IP telephony network and the public switched telephone network PSTN or a legacy PBX device. www.syngress.com 444 Appendix Cisco AVVID and IP Telephony Design Implementation Fast Track Chapter 2 Continued Exploring IP Telephony Applications 0 WebAttendant replaces the traditional PBX attendant console. 0 IP SoftPhone provides a software-based IP telephone handset. 0 Third-party applications include software from Interactive Intelligence Latitude and ISI. Introduction to Video 0 Traditional video-conferencing utilizes ISDN lines in a point-to-point infrastructure. 0 IP-based video-conferencing utilizes the H.323 specification allowing for video-conferencing over a variety of mediums. 0 IP-based video-conferencing is much more efficient than .
