SER-Kamailio - the project that shaped the evolution of open source real time communications SIP Load Balancer, IP Telephony Engine, Least Cost Routing, SIP Firewall, Edge Proxy, SBC, Registrar and Location Service, Instant Messaging and Presence, MSRP, WebRTC, IPv4-IPV6, IMS, VoLTE Welcome To Kamailio – The Open Source SIP Server Kamailio® (successor of former OpenSER and SER) is an Open Source S