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Internet telephony makes use of the Internet Protocol (IP) that computers on the
Internet use to communicate with each other. The parties involved in a typical setup for a computer to voice call include
1. The subscriber (the users), 2. The Voice Over IP (VOIP) service provider, and
3. The user's Internet Service Provider (ISP)
That is, the user needs to first get registered with both the ISP and VOIP service
provider. Now a call using Internet telephony takes place in the following
1. The user makes a call using his/her computer.
2. He/she first gets connected and authenticated by the ISP, which provides the
gateway to access the Internet.
3. The user is then connected to the VOIP service provider's gateway. This
gateway has the Internet telephony software, which converts the packets into voice
form and connects to the telephone network of the destination partly. The called
party's telephone will then ring.
4. Once the call is established, the two gateways will constantly communicate
and ensure that the packets are forwarded with the least loss.
With the growing success of mobile communication technology and proliferation
of mobile devices, such as mobile phones, Personal Digital Assistants (PDAs) and
two-way pagers, there is a growing demand for Internet-enabled hand-held
devices. To meet this demand, several vendors are now producing Internet-enabled
hand-held devices. These devices allow users to access e-mail and web pages on
their mobile devices. Microbrowsers are browsers meant for use with Internetenabled mobile devices. They are designed to work with small, resource-restricted
hand-held devices by, for example, eliminating or reducing the functionality found
in traditional desktop browsers.
Because hand-held devices have limited processing and memory resources,
microbrowsers are designed to be small so that their size is only a fraction of the
size of their desktop counterparts. Thus, while desktop browsers occupy around 20
Mbytes, most microbrowsers occupy only a few hundred Kbytes. Their size...
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- Spring '14