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Federation
A providers' group
that has contractual agreements on various aspects of peering relationship
such as common:
administrative policy,
settlement, and
terminating calls.

The members of a federation may
jointly use a set of entities such as:
location function,
application servers,
subscriber databases,
SIP proxies ,
and/or platforms that synthesize various SIP and non-SIP based applications.
Sohel Khan, Ph.D., Sprint-Nextel
PPT Version