Polycom CX5500 Unified Conference Station Administrator’s Guide 1.1.0
Polycom, Inc. 357
When used with an appropriate server, the User Agent Computer Supported Telecommunications
Applications (uaCSTA) feature on the phone may be used for remote control of the phone from computer
applications such as Microsoft Office Communicator.
The phone is compliant with “Using CSTA for SIP Phone User Agents (uaCSTA), ECMA TR/087” for the
Answer Call, Hold Call, and Retrieve Call functions and “Services for Computer Supported
Telecommunications Applications Phase III, ECMA – 269” for the Conference Call function.
This feature is enabled by configuration parameters described in <SIP/> and <reg/> and needs to be
activated by a feature application key.
SIP for Instant Messaging and Presence Leveraging
Extensions
The phone is compatible with the Presence and Instant Messaging features of Microsoft Windows
Messenger 5.1. In a future release, support for the Presence and Instant Message recommendations in
the SIP Instant Messaging and Presence Leveraging Extensions (SIMPLE) proposals will be provided by
the following Internet drafts or their successors:
● draft-ietf-simple-cpim-mapping-01
● draft-ietf-simple-presence-07
● draft-ietf-simple-presencelist-package-00
● draft-ietf-simple-winfo-format-02
● draft-ietf-simple-winfo-package-02
Shared Call Appearance Signaling
A shared line is an address of record managed by a call server. The server allows multiple endpoints to
register locations against the address of record.
The phone supports shared call appearances (SCA) using the SUBSCRIBE-NOTIFY method in the “SIP
Specific Event Notification” framework (RFC 3265). The events used are:
● call-info for call appearance state notification
● line-seize for the phone to ask to seize the line
Bridged Line Appearance Signaling
A bridged line is an address of record managed by a server. The server allows multiple endpoints to
register locations against the address of record.
The phone supports bridged line appearances (BLA) using the SUBSCRIBE-NOTIFY method in the “SIP
Specific Event Notification” framework (RFC 3265). The events used are:
● “dialog” for bridged line appearance subscribe and notify.
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