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13Chapter
IMS: IP Multimedia
Subsystem
e Internet Protocol Multimedia Subsystem (IMS) was defined by the ird
Generation Partnership Program (3GPP/3GPP2) as a generic standard architecture
for offering IP multimedia services and also voice over IP. IMS was created initially
as a standard for wireless networks. However, the wireline community, in the search
for a unifying standard, has since realized the potential of IMS for fixed communi-
cation as well. Hence, it is being adopted for that purpose. As an international stan-
dard, it provides the framework and the support for fixed-to-mobile convergence [1]
and hence the migration of all