Radvision has improved the API for real-time multimedia over 3G networks in its toolkit for handset developers, it says. The improvements to the “3G-324M” module of Radvision's Ensemble tools will hasten the arrival of high-quality, interoperable 3G-capable handsets, the company says, including those based on embedded Linux.

3G phone networks are defined as being capable of carrying data at 1.5Mbps, or approximately the same speed as terrestrial broadband data networks such as DSL lines and cable modems. Radvision announced its Ensemble tools for 3G handset development in February. In addition to the newly enhanced 3G-324M module, the tools support SIP, SIP/SIMPLE, RTSP, and RTP/RTCP.

According to Radvision, improvements to the 3G-324M module will reduce call set-up time, improve handset interoperability, and improve call quality. Claimed new features include:

• AutoCaps (automatic capabilities), said to allow phones to exchange capabilities data and synchronize channels, with no additional development needed
• Support for the WNSRP, a proposed standard for quick call set up time
• Support for the latest annexes, said to improve call quality
• Shared common cores across multiple communication protocols, enabling multiple 3G protocol support — including SIP, MEGACO, RTSP, and 3G-324M
• Better media control for improved call quality
• Flexible multiplexing and dual video support, for handsets with two cameras, or for interoperability with H.323 systems
• Support of many handset operating systems, including Linux, Windows CE, Symbian, and Nucleus
• Simple APIs for GEF (generic extensibility framework) formats, including MPEG-4, AMR, H.264, and H.239
• A sample interface implementation for 3G WCDMA networks

Radvision's senior director of marketing, Adi Paz, said, “Handset-oriented improvements to our 3G-324M toolkit will enable equipment vendors to produce exciting new devices that will drive 3G multimedia services and adoption.”

 
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