Poikselka M., Mayer G., Khartabil H., Niemi A. The IMS. IP Multimedia Concepts and Services in the Mobile Domain

ИздательствоJohn Wiley, 2004, -450 pp.We have telephony to talk to each other. We have messaging to dispatch mail or instant notes. We have browsing to read published content on known sites. We even have search engines to located content sites, which may have content relevant to. This may look as if we have a lot on our plate; so, do we need Internet Protocol (IP) Multimedia?
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 be something more than just exchanging voice.
We will be sharing real time video (see what I see), an MP3-coded music stream, a white board to present objects and we will be exchanging real time game data. Many of these will be exercised simultaneously. No doubt, we want to break into this completely new ground of communication. Telephony is sufficient for telephones. Multimedia terminals need IP Multimedia networks.
Session Initiation Protocol (SIP) enables clients to invite others into a session and negotiate control information about the media channels needed for the session. IP Multimedia builds on top of this and provides a full suite of network operator capabilities enabling authentication of clients, network-to-network interfaces and administration capabilities like charging. All this is essential in order to build interoperating networks that, when combined, can provide truly global service coverage, in the spirit of good old telephony. This enables a global market of multimedia terminals.
As IP Multimedia is now emerging as the key driver of renewal of maturing mass-market communication services, several technical audiences have an urgent need to understand how it works. Georg Mayer, Aki Niemi, Hisham Khartabil and Miikka Poikselka are major contributors to IP Multimedia industry develop- ment through their work in the standardization arena. This book provides the essential insight into the architecture and structure of these new networks.Part I: ArchitectureIP Multimedia Subsystem Architecture
IMS Concepts
Part II: Detailed ProceduresAn example IMS registration
An Example IMS Session
Routing of PSIs
Part III: Protocols
SIP
SDP
The Offer/Answer Model with SDP
RTP
DNS
GPRS
Diameter
MEGACO
COPS
IPsec
Signalling Compression
DHCP v6
Part IV: Services
Presence
Messaging
Conferencing