B2BUA

The B2BUA mode:

• Acts as UAS and UAC within call flow.
• Includes BYES (can be inserted).
• Keeps transaction state (timers and retransmissions)
• Provides per-session information such as session counters per session agent, RADIUS STOP accounting record generation, CALEA CDC generation.
• Enforces session restrictions (32k) because of state management.
• Can provide media management, including media routing through a single IP address with topology masking, CALEA CCC, media watchdogs for state management.
• Routes full sessions with topology masking. Includes rewriting Via, Route, Contact headers, full NATing with SIP NAT or header manipulation, direct bridging, local policy routing, and ENUM routing.