Kamailio SIP Server

One of our clients wanted SIP to PSTN conversion, but with open source, so after a lot of deliberation, we went with Kamailio SIP Server; we used it for easy conversion of SIP to PSTN. It acted as a firewall where we used to register the SIP signals, and the Kamailio SIP Server will also act as a proxy server to redirect calls to the proper PSTN gateway based on the configurations. It was also a great load balancer and a security firewall for our client's PSTN gateways.

Kamailio SIP Server is very well suited if you want to secure your main servers; it can perfectly act as a proxy server and a gateway to your main server. It also does load balancing and call transfers easily based on the configurations done.