User Agent Client

What Does User Agent Client Mean?

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.

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A UAC is a network server, email client, search engine or Web browser.

Techopedia Explains User Agent Client

Request for Comments (RFC) 1945 requires:

  • All UAC formats must include a product and optional comment string.
  • The user agent (UA) header field is used by HTTP, SIP and Simple Mail Transfer Protocol/Network News Transfer Protocol (SMTP/NNTP).

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]

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Margaret Rouse

Margaret Rouse is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical, business audience. Over the past twenty years her explanations have appeared on TechTarget websites and she's been cited as an authority in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine and Discovery Magazine.Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages. If you have a suggestion for a new definition or how to improve a technical explanation, please email Margaret or contact her…