Transcript What Is VoIP?

Report for Case 5
VoIP Will Bring “Dramatic Transformation”
Liang Qinyan, Li Yang, Zhou Xuhui, Lin Guoqiang
Group 2
MIS-B Xi’An
2004-5-22
Agenda
What Is VoIP?
VoIP Communication Model
Changing the Communication and Business Way
VoIP Regulation
Advantage and Need Improved
Current status in PRC
Development trend

What Is VoIP?
信令技术保证电话呼叫的顺利实现和话音质量,目前被广泛接受的VoIP控
制信令体系包括ITU－T的H.323系列和IETF的会话初始化协议SIP。
VoIP中网络传输技术主要是TCP和UDP,此外还包括网关互联技术、路由
选择技术、网络管理技术以及安全认证和计费技术等。
网关由公用电话网PSTN中继接口、数字信号处理板DSP、主处理器、全
局RAM、以及以太网卡等设备组成。
VoIP Communication Model
•Phone to Phone
•Phone to PC
•PC to PC
•PC to Phone
Fixed phone
network
Fixed phone
network
IP network
Mobile phone
Network
PC
ISP
ISP
Mobile phone
Network
PC
Changing the Communication
and Business Way

Voice email
Hear anytime, can forward it to another person

Virtual phone number
- One virtual phone number instead of many phone number with
different area codes
- Ring desktop, laptop or forward to where you trip to

Speaker phone over VoIP
- Conference
- E-learning
VoIP Regulation
VoIP Regulation will affect VoIp development




Law enforcement assistance
Technology standard
Managing security
Control the using
Advantage and
Need Improved

Advantage




Reduce cost (通过Internet打长途电话的成本仅相当于
传统电话的1/5,最多不到5O%)
Mobility
New capabilities being added
Need Improved


Quality problem
Management problem
Current status in PRC
Development trend


Combine VoIP with wireless technology
(WiFi)
More service funcatons will be developed
人们已在越来越多地讨论“三网合一”，即电信网、有线电视网和计算机网
的融合。在这个融合过程中，视频、语音的通信将是极其重要的市场驱动力。
主要的应用方面包括：集团内部电话、网络视频传输、网络商务、监控系统
应用等。
THANKS