How Does SIP Work?

SIP utilizes two end points from installed user agents (UA) on communication devices like an IP phone, mobile phone, wireless device, or computer. The UA can be the client or the server. UA is the client (UAC) when sending SIP requests; the server when it is a recipient (UAS). There is also a back-to-back user agent (B2BUA) which mediates the two user agents. Direct communication occurs when the devices recognize the other’s IP address or Uniform Resource Identifier (URI.) Usually, however, SIP servers allow for an infrastructure that can route and authorize communication. SIP utilizes two end points from installed user agents (UA)on devices such as an IP phone, mobile phone, wireless device, or computer. The UA can be the client or the server. UA is the client (UAC) when sending SIP requests; the server when it is a recipient (UAS). There is also a back-to-back user agent (B2BUA) which mediates the two user agents. Direct communication occurs when the devices recognize the other’s IP address or Uniform Resource Identifier (URI.) Usually, however, SIP servers allow for an infrastructure that can route and authorize communication.



 
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