Glossary:Back-to-Back User Agent
Also known as a B2BUA. A logical entity that receives a request and processes it as a user-agent server (UAS). In order to determine how the request should be answered, it acts as a user-agent client (UAC) and generates requests. Unlike a proxy server, it maintains dialog state and must participate in all requests that are sent on the dialogs that it has established. The Genesys SIP Server functions as a B2BUA.
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