MediaProxy is a far-end NAT traversal solution for OpenSER
and SIP Express Router that has the following features:

  - Distributed geographical location
  - Scalability, load balancing and redundancy
  - Real-time sessions statistics
  - Configurable IP and UDP port range
  - Support for audio and video streams
  - Support for multiple media streams per call
  - Accounting of network traffic

WWW: http://mediaproxy.ag-projects.com/