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Internet users are rapidly increased, and various services, which use Internet, are invented. Internet telephony service is one of them. As Internet services become an ever more important part of people lives - backed by a marked increase in the number of Internet population - a flow of value-added Web services have been introduced to the market. Internet telephony service was born as a more economical...
Next to the binary-based H.323 signaling protocol for Internet telephony service developed by the Telecommunication World (ITU-T), a more lightweight text-based protocol was deemed necessary to address the specific needs of the Internet World. The session initiation protocol (SIP) was introduced in the IETF and has meanwhile gained maturity and support. The SIP-based Internet telephony service guarantees...
Today the world is undergoing a massive shift from the traditional PSTN to all-IP-based Internet telephony, implying an eventual replacement of the PSTN with VoIP sooner or later. However FCC's decision to "require VoIP service providers to supply E911 capabilities to their customers" imposes legal controls. Internet telephony users have an expectation to be able to initiate a request for...
SIP has been used to develop many kinds of SIP service, such as instant messaging, conference and presence, and these various services are being bundled to one application. To make an application which supports various services may be not easy since the behavior of transaction user of the application is obviously become very complicated. In this paper, we describe a design of SIP transaction distributor...
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