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Unformatted text preview: ion. 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 manner: 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. Microbrowser 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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