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RADVISION NAT Traversal Toolkit is a STUN (Simple Traversal Underneath NAT) developer solution for STUN Clients and Servers that complies with IETF Standard RFC 3489 and the latest draft-ietf-behave-rfc3489bis-18.

The Toolkit enables support for both existing STUN servers, as well as those under development, and serves as a foundation for ICE (Interactive Connectivity Establishment), which is based on the updated STUN standard.


 
The STUN NAT Traversal Toolkit is used to develop:
  • NAT aware VoIP Clients 
  • STUN Servers
  • ICE-ready network elements
  • Terminals
  • Gateways
STUN NAT Traversal Toolkit Highlights
  • Compliancy to RFC 3489 and draft-ietf-behave-rfc3489bis-18Enables development of STUN clients and servers compliant with current STUN servers and ready for future generations of STUN, which are mandatory for ICE.
  • Part of the RADVISION protocol stack family for seamless integration with all RADVISION’s protocol stacks, including SIP, MEGACO, DIAMETER, RTSP, and RTP.

The NAT Traversal Challenges

With the growing awareness of the advantages of voice and video telephony over the Internet, the need for viable standard-based solutions to traverse NAT are felt by enterprise and home users alike. NAT traversal solutions are necessary to allow transparent communication with anyone, anywhere in the world, while maintaining security and privacy.

The STUN protocol was developed to solve certain NAT shortcomings. While providing many benefits, NATs can break many existing IP applications, making it difficult to deploy new ones.










STUN NAT Traversal Toolkit Architecture
The user application is built on top of one or more Signaling Toolkits, and is plugged on top of the STUN NAT Traversal stack. The STUN NAT Traversal stack enables STUN negotiation and uses signaling and RTP stacks for the actual call/dialogue.

STUN NAT Traversal Toolkit Interoperability
All RADVISION products and solutions take into account interoperability issues between disparate networks, protocols and devices. The STUN NAT Traversal stack has been thoroughly tested for full interoperability.

As a significant contributor in the IETF related working groups (BEHAVE, MMUSIC), RADVISION contributes and follows closely STUN standardization. This is very important in ensuring interoperability with other STUN implementations and the ability to integrate NAT traversal solutions with different protocols, such as SIP, RTSP, MEGACO and others in different network topologies.

The STUN NAT Traversal stack is based on RADVISION’s Common Core, an operating system abstraction layer specifically optimized for communication protocols and embedded platforms. This ensures easy portability of developed products between platforms and operating systems, including those not directly supported by RADVISION.

The STUN NAT Traversal comes with:


  • Full Source Code
  • Complete source code sample application
  • Full documentation, programmer's guide and reference guide
  • Porting guide (for unsupported operating systems)
  • Training
  • Version upgrades
  • Professional customer support
  • Turnkey solutions (upon request)
  • Porting services (upon request)


The NAT Traversal stack is part of RADVISION's SIP Developer Suite, which includes SIP-related toolkits, add-ons, and products that provide all the capabilities a SIP network-element developer needs. The RADVISION NAT Traversal stack works either in conjunction with other RADVISION stacks or as a standalone implementation.
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