Dialexia VoIP Softswitches, IP PBX for medium and enterprise organizations, billing servers.Dialogic Corporation Powermedia Media Servers, audio and video SIP IVR, media and conferencing servers for Enterprise and Carriers.Creacode SIP Application Server Real-time SIP call controller and IVR product for carrier-class VoIP networks.Comverse Technology softswitch, media applications, SIP registrars.CommuniGate Pro, virtualized PBX for IP Centrex hosting, voicemail services, self-care.Cisco SIP Proxy Server, Cisco unified border element (CUBE), Cisco Unified Communication Manager (CUCM).Brekeke PBX, SIP PBX for service providers and enterprises.Brekeke SIP Server, SIP proxy, SIP registrar, SIP NAT, TCP/UDP.Avaya Application Server 5300 (AS5300), JITC certified ASSIP VoIP.Aricent SIP UA stack, B2BUA, proxy, VoLTE/RCS Client.3CX Phone System, for Windows, Debian 8 GNU/Linux.3Com VCX IP telephony module: back-to-back user agent SIP PBX.Enterprise Communications System sipXecs.Mobicents Platform (JSLEE 1.0 compliant and SIP Servlets 1.1 compliant application server).Cipango SipServlets 1.1 application server.Servers Free and open-source license Ī SIP server, also known as a SIP proxy, manages all SIP calls within a network and takes responsibility for receiving requests from user agents for the purpose of placing and terminating calls.