Sippy B2BUA is a RFC3261-compliant Session Initiation Protocol

Session Initiation Protocol

The Session Initiation Protocol is an IETF-defined signaling protocol widely used for controlling communication sessions such as voice and video calls over Internet Protocol . The protocol can be used for creating, modifying and terminating two-party or multiparty sessions...

 (SIP) Back-to-back user agent

Back-to-back user agent

A back-to-back user agent is a logical network element in Session Initiation Protocol applications. SIP is a signaling protocol to manage multimedia Voice over Internet Protocol telephone calls...

 (B2BUA) software distributed under the terms of GPL Free Software license.

Features

• 5,000-10,000 simultaneous sessions per server;
• 150-200 calls/second per server;
• Realtime calls control and call data records (CDRs) generation using RADIUS
  RADIUS
  Remote Authentication Dial In User Service is a networking protocol that provides centralized Authentication, Authorization, and Accounting management for computers to connect and use a network service...
  
  ;
• Optional ability to use RTPProxy for media relaying;
• Seamless compatibility with majority of popular SIP software and hardware on the market today;
• Robustness and Resilence;
• Simple and clean internal design making implementing new features and services easy;
• B2BUA could be easily combined with other Open Source software, such as SIP Express Router to build complete softswitch solution.

History

Sippy B2BUA was designed with robustness and performance in mind and now being used by several hundreds ITSPs all around the globe. The software now is being actively developed and maintained by the Sippy Software, Inc..