What is a Back-to-Back User Agent?
A Back-to-Back User Agent (B2BUA) is a core component in SIP-based communication systems that manages call signaling between two endpoints. Acting as both a user agent server and client, it splits the call into two separate legs—allowing full control over call setup, modification, and termination. Back-to-Back User Agent’s are commonly used in contact centers to enable features like call recording, call transfers, and advanced routing logic.
Benefits of a Back-to-Back User Agent
Using a Back-to-Back User Agent enables:
Full control over SIP call flow and signaling
Seamless support for call recording and monitoring
Easier integration of advanced call routing logic
Enhanced security through media and signaling separation
Greater flexibility for feature-rich contact center deployments
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