Kamailio

Easy to use but advanced IP PBX system, VoIP gateway and conference server.

Scalable cross-platform telephony platform.

SIP proxy/server for voice, video, IM, presence and any other SIP extensions.

Complete, modular and scalable SIP server, includes a push gateway, to deliver SIP incoming calls or text messages on mobile device platforms where push notifications are required to receive information when the app is n

Troubleshooting and monitoring VoIP calls.

Lightweight SIP proxy, location server, and registrar for a reliable and scalable SIP infrastructure.