This is an important concept to understand
and something that will become more clear as we discuss how identities are
defined and used within the network.
Device Identity in the IMS
There are different levels of addressing used within any network. The lowest form of
addressing in a network is the actual address of the connection itself. The connection
address is assigned, usually, by the network and is used to route sessions or calls to the
device in the network. Depending on the access method used, the connection address
may represent a location for the device. The connection address format will also depend
on the method of access.
The wireline telephone network uses telephone numbers assigned to subscribers and
their devices with a connection within a switch, referred to as the subscriber line. A
subscriber line is a physical connection within the switch serving the connection. It is
static, does not change, and sits idle until the subscriber on the other end wishes to use
the connection (or until someone tries to call the subscriber). There is no other public
identity for the subscriber, and as long as the subscriber does not move to another place,
this methodology works fine.
However, if subscribers are not home, there is only one way to reach them. You have
to call them using their work number, which is probably provided by another company.
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