Foreword by Petri Pöyhönen
We have telephony so that we can talk to each other. We have messaging so that we can dispatch mail or instant notes. We have browsing so that we can read published content on known sites. We even have search engines to locate content sites, which may have content relevant to us. This may look as if we have a lot on our plate; so, do we need Internet Protocol (IP) Multimedia Subsystem (IMS)?
The problem is that we have no practical mechanism to engage another application-rich terminal in a peer-to-peer session. Enormously successful mobile telephony shows that there is immense value in sharing with peers. With increasingly attractive terminals, the sharing experience will become much more than just exchanging voice.
We will be sharing real-time video (see what I see), an MP3-coded music stream,[] a whiteboard to present objects and we will be exchanging real-time game data. Many of these will take place simultaneously. There is undoubtedly the need to break into this completely new ground of communication.
[] MP3 is the voice compression method developed by the Moving Picture Experts Group (MPEG), by means of which the size of a voice-containing file can be reduced to one-tenth of the original without significantly affecting the quality of voice.
Telephony is sufficient for telephones. Multimedia terminals need IMS networks.
Session Initiation Protocol (SIP) enables clients to invite others to a session and negotiate control information about the media ...
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