HP-UX Java SIP Stack Programmer's Guide (February 2008)

• HeaderFactory
This interface defines methods to create new headers objects.
• MessageFactory
This interface defines methods to create new request and response objects.
HP-UX JSR32 Features
This section discusses the features in the HP implementation of the JSR32 APIs.
This section addresses the following topics:
• “Event Notification” (page 42)
• “The REFER Method” (page 43)
• “SIP for Telephones” (page 43)
• “Provisional Response Acknowledgement in SIP” (page 43)
• “E.164 Number Mapping” (page 44)
• “Parsing Different URIs” (page 44)
• “Additional SIP Extensions” (page 44)
• “Persistent Connection” (page 45)
• “Transport Support” (page 45)
• “Support for IPv6 Addresses” (page 45)
• “Configuration Parameters” (page 45)
Event Notification
In a SIP infrastructure, a SIP node requests event notifications from the remote nodes
to indicate that certain events have occurred. Hence, it is important for the end nodes
to co-operate with each other in providing appropriate event notifications. The SIP
services that request event notification include automatic callback services, buddy lists,
message waiting indications, presence, and public switched telephone network (PSTN
) and internetworking.
The SIP stack supports the following SIP methods to subscribe for events and to notify
events:
• SUBSCRIBE
The SUBSCRIBE method is used to request asynchronous notification of an event
or a set of events.
• NOTIFY
The NOTIFY method is used to notify a SIP node that an event requested by the
previous SUBSCRIBE method has occurred. The NOTIFY method also provides
further details about the event.
For more information on these methods, see RFC 3265 (SIP Specific Event Notification).
42 JSR32 JAIN SIP APIs