SESSION INITIATION FROM APPLICATION SERVERS IN AN IP MULTIMEDIA SUBSYSTEM

摘要

The present invention provides a technique where application servers can
initiate sessions within the IMS network by initially sending session
initiation messages to the I-CSCF. By routing the session initiation messages
to the I-CSCF, the application servers need not directly access the HSSs in
order to initiate sessions. Upon receiving a session initiation message from
an application server, the I-CSCF may access the HSS to identify an S-CSCF to
use for session control and then route the session initiation message to that
S-CSCF. The S-CSCF may then access the same or different HSS to determine how
to further route the session initiation message to establish the session. The
session initiation message may be routed toward other S-CSCFs en route to the
appropriate user elements. The session may be a session established between
user elements or between the application server and a user element.