Types of SIP servers
There are a few different types of SIP servers. Depending on the application, you can use one or all of them in your solution. OpenSIPS can behave as a proxy, redirect, B2BUA, or Registrar server.
The proxy server
In the SIP proxy mode, all SIP signaling goes through the SIP proxy. This behavior will help in processes such as billing and is, by far, the most common choice. The drawback is the overhead caused by the server in the middle of all the SIP communications during the session establishment. Regardless of the SIP server role, the RTP packets will go directly from one endpoint to another even if the server is working as a SIP proxy.
The redirect server
The SIP proxy can operate in the SIP redirect mode. In this mode, the ...
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