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The mandate of this working group is to facilitate effective service interoperability utilizing SIP in heterogeneous network environments as noted below. SIP's approach to supporting more advanced features and applications has been to specify a number of primitive operations, including refer, dialog replacement and joining, and event packages, and then to allow those primitives to be combined in many ways to realize different features. This approach avoids the need for standardized definitions of a feature, which can severely limit innovation and broad applicability. |