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.