In, a user agent client, abbreviated UAC, is
RFC 3261, section 6
a logical entity that creates a new request, and then uses the state machinery to send it. The role of UAC lasts only for the duration of that transaction. In other words, if a piece of software initiates a request, it acts as a UAC for the duration of that transaction. If it receives a request later, it assumes the role of a user agent server for the processing of that transaction.
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