Cisco Unified Presence takes advantage of Session Initiation Protocol (SIP) technology to
support new voice services in the enterprise environment. SIP enhances the voice network
by providing a core set of behaviors for session establishment and control that can be
applied in a wide array of features and services. In addition to core SIP support, Cisco
Unified Presence uses SIP for Instant Messaging and Presence Leveraging Extensions (SIMPLE)
technology to support both instant messaging and presence. Cisco Unified Presence consists
of a SIP presence engine and a SIP proxy function. The presence engine collects user presence
information (such as busy, idle, away, or available status) as well as user capabilities (such
as the capability to support voice, video, instant messaging, and Web collaboration) and
compiles the data in a repository for each user. This repository is accessed by the
applications and features that each user employs. Unique user rules and privacy can be
applied by each user to help ensure that only authorized applications and users have access
to presence information. The SIP proxy function facilitates efficient and accurate routing
of both presence and general SIP messaging through the enterprise. Cisco Unified Presence is
tightly integrated with various desktop clients and applications. It helps Cisco Unified
Personal Communicator, the Cisco enterprise desktop client, to perform numerous functions
such as click to dial and phone control and voice, video, and Web collaboration. In addition,
Cisco Unified Presence provides a core instant messaging service for Cisco Unified IP Phones
connected to Cisco Unified Communications Manager. Cisco Unified Presence also supports
interoperability with enterprise desktop applications such as IBM Sametime and Microsoft Office
Communicator, allowing these desktop applications to operate in conjunction with Cisco Unified
IP Phones supported on Cisco Unified Communications Manager.
http://www.cisco.com/en/US/prod/collateral/voicesw/ps6788/vcallcon/ps6837/product_data_sheet0900aecd805e325a.html
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