We have discussed a lot about subscriber and service identifiers in the IMS. As we
discuss other processes within the IMS, it will become even clearer the value these
identities bring to service providers.
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Chapter 5
Establishing a Session in the IMS
In legacy networks, subscribers make voice calls. They use a different network to send
e-mails, and yet another network to access the Internet through a wireless connection.
They watch videos and television broadcasts through another network such as cable
and satellite.
The Internet has forever changed this paradigm. No longer will we need all of these
disparate networks in our lives to communicate and entertain ourselves. As operators
begin transforming their networks into an all-IP infrastructure capable of supporting
all of these media types, all we need is a single connection point.
The IMS brings this possibility to reality. It allows a subscriber to establish a single
connection for everything that subscribers need, including voice and video. Once that
connection to the network is made, everything he or she needs becomes immediately
available through that connection. However, the network still needs multiple sessions.
Everything that a subscriber does to communicate becomes a session in the IMS
environment. This is probably the largest benefit of IMS networks.
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