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A Quick Introduction to Voice over Internet Protocol (VoIP)



Internet Basics

The basic building block of networks is the IP datagram.
Analogy to datagrams—a postcard with
Destination address
Return address
A small amount of text
A postcard might inform you of a friend’s holiday travels or remind you of a dentist’s appointment.
The postal service doesn’t care which application (friend or dentist) sent the postcard—it just carries processed wood pulp with black marks.

Voice—Another A ....etc

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Voice Over Internet

In order to develop a high quality real time voice transmission system using VoIP, reliability and predictability are two major problems. Reliability ensures the reliable delivery of voice packet so that loss is concealed from user, whereas predictability avoids the delivery of voice packet with excessive delays and to maintain the certain playback rate. These requirements can be measured by quality of services (QoS) measure. The key QoS measure includes the end-to-end delay, jitter and loss. Jitter is a time diffe ....etc

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VoIP, or Voice over Internet Protocol refers to sending voice and fax phone calls over data networks, particularly the Internet. This technology offers cost savings by making more efficient use of the existing network.
Traditionally, voice and data were carried over separate networks optimized to suit the differing characteristics of voice and data traffic. With advances in technology, it is now possible to carry voice and data over the same networks whilst still catering for the different characteristics required by voice and data.
Voice-ov ....etc

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Voice over Internet Protocol (VoIP), is a technology that allows you to make voice calls using a broadband Internet connection instead of a regular (or analog) phone line. Some VoIP services may only allow you to call other people using the same service, but others may allow you to call anyone who has a telephone number - including local, long distance, mobile, and international numbers. Also, while some VoIP services only work over your computer or a special VoIP phone, other services allow you to use a traditional phone connected to a VoIP ....etc

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Definition
Using an ordinary phone for most people is a common daily occurrence as is listening to your favorite CD containing the digitally recorded music. It is only a small extension to these technologies in having your voice transmitted in data packets. The transmission of voice in the phone network was done originally using an analog signal but this has been replaced in much of the world by digital networks. Although many of our phones are still analog, the network that carries that voice has become digital.

In todays phone networks, t ....etc

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Service-Oriented Analysis Service Modeling




Service modeling guidelines



Take into account potential cross-process reusability of logic being encapsulated
Consider potential intra-process reusability of logic being encapsulated
Factor in process-related dependencies
Model for cross-application reuse
Speculate on further decomposition requirements
Identify logical units of work with explicit boundaries
Prevent logic boundary creep
Emul ....etc

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