User Agent Server

What Does User Agent Server Mean?

User Agent Server (UAS) is a Voice over Internet Protocol (VoIP) application that responds to User Agent Client (UAC) service requests based on input or other external stimuli in Session Initiation Protocol (SIP) systems.

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Techopedia Explains User Agent Server

Pursuant to RFC 1945, the User Agent (UA) header field is used by HTTP, SIP and Simple Mail Transfer Protocol/Network News Transfer Protocol (SMTP/NNTP).

The SIP UA uses the client-server protocol to facilitate peer-to-peer (PTP) calls. During the client-server conversation, the UA’s identity is transmitted in HTTP or SIP via the header’s UA field. This information is used to set optional communication session parameters, such as providing properly formatted content to desktops or smartphones.

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Margaret Rouse
Technology Expert

Margaret 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 IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.