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4. The challenges of Internet telephony
The still young field of Internet telephony is receiving considerable attention from many players in the telecommunications sector. This is not surprising, given that this field is considered to be the forerunner of new computer-assisted interpersonal communications. In this context, the Internet is the most natural medium, because as a single network carrying all types of data, it meets the need for service integration and offers the opportunity for massive reductions in infrastructure costs. In terms of applications, the use of the Internet makes it easy to combine voice communications with other modes of communication, whether synchronous or not: World Wide Web browsers can interface with telephony applications to enable a user to initiate a communication simply by clicking on a particular hyperlink (e.g. calling a sales agent for further information or to place an order). Shared applications,...
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The challenges of Internet telephony
References
Recommendations
ITU-T (International Telecommunications Union)
- Call Signalling Protocols and Media Stream Packetization for Packet-based Multimedia Communications systems. - H.225.0 - 2003
- Security and Encryption for H series (H.323 and other H.245 based) Multimedia Terminals. - H.235 - 2003
- Control Protocol for Multimedia Communication. - H.245 - 2005
- Interworking of H. Series multimedia terminals with H....
Documentation source
H.323 architecture
The primary source of information is the ITU-T (International Telecommunication Union). ITU-T recommendations can be obtained via the World Wide Web by consulting the http://www.itu.int/home/index.html server.
IETF architecture
Information on IETF developments...
Internet telephony hardware and software
A large number of telecommunications and IT players have invested in the Internet telephony sector. You'll find offers from VocalTech, Cisco, iFace, Nokia, 3Com, Alcatel, Ascend, Ericsson, Lucent, Motorola, Netspeak, Siemens and more.
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