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This appendix lists examples of Session Initiation Protocol (SIP) services and features and the type of support provided by Cisco Unified Border Element (SP Edition).
The following table lists some examples of SIP services and features and extent of interoperability and compliance provided by Cisco Unified Border Element (SP Edition) on the unified model.
Many of the SIP services or features in the table are listed in the draft-ietf-sipping-service-examples.txt specification.
The table covers most features offered in what are considered IP Centrex offerings from local exchange carriers and PBX (Private Branch Exchange) features. The table also includes services involving some extensions to SIP, including the REFER, SUBSCRIBE, and NOTIFY methods and the Replaces and Join headers.