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Internet Phone System : Part 2

The effort to reduce traditional PSTN telepnone expenses started with the introduction of chat applications such as Talk. IRC (Internet RElay Chat). Webboard ans Instant Messenger software such as ICQ, AOL Instant Messenger, MSN, Qnext, Yahoo! Messager, or Jabber. At early period, conversation could be done through text messaging and file sharing. The capability of these applications later extended to voice transmission. However, as connectivity was subject to limited bandwidth, especially among home users who largely were using dial-up service. In addition, as voice transmission technology was not good enough, it could not support real time conversation which required high bandwidth.

When Internet has been widely expanded and high speed connectivity becomes more common, the more IM applications are developed with enhanced features to support real-time conversation. One of the best known applications is Skype which quickly gains popularity as it is a feeware that provides efficient voice communications. This marks the beginning of VoIP applications for personal use and the development of other applications under the same category such as Google Talk, MSN and Yahoo! Messenger.

The use of VoIP in business world is developed under the Video Conference platform which supports voice, video and data at the same time. Video Conference Forum consisting of world's leading firms such as Cisco, VocalTec, 3COM and Netspeak jointly developed the H.323 standard to support IP voice and video communications. The standard is accredited by ITU (International Telecommunication Union) as an official standard for video conference based on Real-time Protocol (RTP). As it is difficult to guarantee the quality of data transmitted over the Internet, QoS (Quality of Service) is defined to avoid delay or jitter. This is the most difficult part in managing video conferencing because it is possible that some certain points are beyond control during transmission. As a result, ITSP (Internet Telephony Service Provider) emerges to provide guaranteed service at both ends.

ѹ 17 - 06 - 2006  

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