What's New in WebLogic SIP Server 2.2

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Sheng Sheen's Blog | May 18, 2006   6:51 AM | Comments (0)

• Improved system performance
• Converged Application API that allows for application-based monitoring and call control
• Supports for Reliable messaging
• Manage large content payloads through indirection
• Supports for the Diameter Sh interface for user-profile lookups
• Improved the ability to do quick application upgrades\transitions
• Made the server more reliable on its own and in a cluster

New RFCs Supported:

• RFC 2543: SIP: Session Initiation Protocol (v1) backward compatibility is supported
  
• RFC 3262: Reliability of Provisional Responses in the SIP is supported
  
• RFC 3327: SIP Extension Header Field for Registering Non-Adjacent Contacts is supported
  
• RFC 3515: The SIP REFER Method is supported
  

RFC 3262: Reliability of Provisional Responses in the SIP is supported

• As defined in http://www.ietf.org/rfc/rfc3262.txt
  SIP Servlets can acknowledge a provisional response (and stop retransmissions of prvisional response)
  
• Create a PRACK request using com.bea.wcp.sip.WissSipServletResponse.createPrack() method
  
• Also JSR116’s SipServletResponse.createAck() was modified to automatically return a PRACK request instead of an ACK request for provisional responses
  
• Either method can be used to acknowledge provisional responses
  

• Requireed by 3GPP IMS, WLSS provides limited support for modifying Contact header parameters
  
• Applications can use the SipServletMessage.getAddressHeader(“Contact”) method to return a Contact address object whose parameters can be modified
  
• Additionally, UAS can modify Contact header parameters for a 200 response to an OPTIONS request, as required in RFC 3261
  

• Unattended call transfer
  
• Attended call transfer
  
• Third-party call control (3PCC)
  

• Implicit subscription is used
  
• WLSS maintain a SIP dialog after the REFER method is used even if a subsequent BYE message is sent to ensure call transfer applications can re-establish the original session (via an INVITE) if the call transfer fails
  
• Extends the JSR116 SipServlet class to provide a method for handling the REFER request, extend com.bea.wcp.sip.WissSipServlet and implement doRefer()
  

• WLSS 2.2 enables you to store call state data in an Oracle RDBMS instead of using a cluster of data-tier servers
  
• Only recommended if you have a very large amount of long-lives call state data and you do not have strict requirements for latency performance
  
• New failover detection mechanism to improve failover performance for data tier server
  
• Engine tier caching is available optionally, used with SIP-aware load balancer to increase performance
  
• Upgrade a deployed SIP application to a different version without losing calls that the application is currently processing
  Supports two different versions of the same application
  

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