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A User Agent Client (UAC) is a Session Initiation Protocol (SIP) or Voice over Internet Protocol (VoIP) application that serves as a peer-to-peer (P2P) communication gateway and generates distributed network service requests.
A UAC is a network server, email client, search engine or Web browser.
Request for Comments (RFC) 1945 requires:
The UAC submits its ID string to the User Agent Server (UAS) with application type, OS or client/server revisions.
In a Web browser, the UA string format reads as follows:
Mozilla/[version] ([system and browser information]) [platform] ([platform details]) [extensions]