ATIS Telecom Glossary
Wednesday, October 22, 2014

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user agent (UA)

An entity that carries out specific functions on behalf of its owner or user. Such functions usually entail requesting some service or responding to a request for service. When requesting service, the User Agent acts as a User Agent Client (UAC), and when responding to a request for service, it acts like a User Agent Server (UAS).

 

For example, a SIP User Agent is a logical entity that can act as both a UAC and a UAS. As a UAC, it creates a new SIP request on behalf of the user. This request is sent to the UAS, which generates a response to the SIP request. The UAC and UAS maintain the client/server roles for the duration of the transaction.

 

 

 

 

 

 

 

 

 

 



 
These definitions were prepared by ATIS Committee PRQC
 
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