““openSIPS is a multi-functional, multi-purpose signaling SIP server - it can act as SIP Router/Switch, SIP Registrar, Application Server, Redirect Server, Load Balancer / Dispatcher, Back-to-Back User Agent, Presence Server, IM Server, Session Border Controller, SIP Front-End, NAT traversal Server, IP Gateway (SMS, XMPP) and others.””

— http://opensips.org/

openSIPS is not, however, particularly easy to configure, especially for people who are not comfortable with scripting.

We use openSIPS in a few different places in our network, and plan on writing several posts on how to configure it for different purposes.

We use it for the following purposes:

Load balancing for redirect traffic
Routing inbound DIDs
As an SBC for voice termination for our WebRTC client, FireRTC
To generate call detail records

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