Polycom SIP 2.2.2 - Manual (Page 215)

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Session Initiation Protocol (SIP)
This chapter provides a description of the basic Session Initiation Protocol
(SIP) and the protocol extensions that are supported by the current SIP
application. To find the applicable Request For Comments (RFC) document,
go to http://www.ietf.org/rfc.html and enter the RFC number.
This chapter contains information on:
• Basic Protocols—All the basic calling functionality described in the SIP
specification is supported. Transfer is included in the basic SIP support.
• Protocol Extensions—Extensions add features to SIP that are applicable to
a range of applications, including reliable 1xx responses and session
timers.
For information on supported RFC’s and Internet drafts, refer to the following
section, RFC and Internet Draft Support .
This chapter also describes:
• Request Support
• Header Support
• Response Support
• Hold Implementation
• Reliability of Provisional Responses
• Transfer
• Third Party Call Control
• SIP for Instant Messaging and Presence Leveraging Extensions
• Shared Call Appearance Signaling
• Bridged Line Appearance Signaling