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SailFin Project Progresses toward Version 2

Posted by editor on July 21, 2009 at 5:27 AM PDT

Development of the SailFin project, which provides high-availability and clustering capability for SIP servlets (JSR 289), is proceeding toward a scheduled October release for Version 2. Binod P G just posted a summary of the latest SailFin news in the Aquarium:

Diameter support in SailFin is progressing well. Venu has blogged about steps to use Sh api for updating user profile information in HSS (eg: Open IMS). In another post, he explains using onine charging in SailFin.

Geertjan Wielenga interviewed SailFin developers Vince Kraemer and Binod P G in March 2008 on the JavaLobby site in an article titled SailFin: When Java EE Met SIP. He starts out the article with an introduction to SIP:

SIP (Session Initiation Protocol) technology is behind many of today's popular services, such as VoIP, instant messaging, and web conferencing. Underpinning SIP is the SIP Servlet, initially defined in JSR-116 and, since then, updated in JSR-289. The latter defines a standard application programming model to mix SIP Servlets and Java EE components.

SailFin's unigue role is that it brings these capabilities to the GlassFish application server. The Version 2 software has just entered SCF (soft code freeze), and the SCF build is currently available for download. The current SailFin Version 2 development schedule calls for a hard code freeze on August 26, and final release on October 28.

So, what does Binod mean by "Diameter support"? He wrote about this in an April post:

The Diameter protocol (RFC 3588) is designed to provide an Authentication, Authorization and Accounting (AAA) framework for applications. SailFin will be adding support for Diameter protocol by 2nd half of CY2009. Sh (Subscriber profile interface), Rf (Offline Charging interface), Ro (Online charging interface) will be available.

The RFC says that Diameter is "intended to work in both local Authentication, Authorization & Accounting and roaming situations." Naman Mehta wrote a fairly detailed Introduction to Diameter Protocol in March. It turns out that the name "Diameter" came about as a pun on RADIUS, the predecessor protocal. RADIUS stands for Remote Authentication Dial In User Service. As Naman notes, " diameter is twice the radius."

Diameter protocol came as a result of developments to eliminate limitations with the radius gateway. It serves similar purpose in AAA applications however, advanced processes and operations were added to the protocol to make it reliable. This included the addition of attribute value pairs (AVPs) and error notification which was not present on older protocols. Diameter is not directly backwards compatible, but provides an upgrade path for RADIUS.

Venu Gopal summarized the Diameter support that will be included in SailFin in a recent blog post:

Highlights of Diameter support in Sailfin

  • 1.Easy to use API , interfaces provided for AVP's defined in 3GPP specs and RFC's
  • 2.Easy to query additional AVP's in a Grouped AVP.
  • 3.Easy to add new AVP support using dictionary or annotations.
  • 4.Ability to send messages in a synchronous or asynchronous manner(Listener support to receive asynchronous responses)
  • 5.Interfaces defined to build messages as per 3GPP specifications.
  • 6.Easy to build custom messages as shown in the code snippet.

For more information on SailFin, visit the project's home page on java.net


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In SailFin Diameter Support - Online Charging, Sh API., Binod PG writes "Diameter support in SailFin is progressing well. Venu has blogged about steps to use Sh api for updating user profile information in HSS (eg: Open IMS). In another post, he explains using onine charging in SailFin..."


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Development of the SailFin project, which provides high-availability and clustering capability for SIP servlets (JSR 289), is proceeding toward a scheduled October release for Version 2...