31 Like Asterisk Good alternative? YES NO Asterisk is free software that transforms a computer into a communication server. Asterisk lets you build applications like PBX, VoIP gateway, IVR and ACD. Free Open Source Mac Windows Linux Low level Add a feature
12 Like FreeSWITCH Good alternative? YES NO FreeSWITCH is a scalable open source cross-platform telephony platform designed to route and interconnect popular communication protocols using audio, video, text or any... Free Open Source Mac Windows Linux BSD No features added Add a feature
7 Like Yate - Yet Another Telephony Engine YES NO Yate is a softswitch (concept of separating the network hardware from network software). It supports VoIP protocols: H.323, SIP, IAX1, IAX2, RTP. For the plain old... Free Open Source Linux No features added Add a feature
2 Like kamailio Good alternative? YES NO Kamailio® (successor of former OpenSER and SER) is an Open Source SIP Server released under GPL, able to handle thousands of call setups per second. Among features:... Free Open Source Linux No features added Add a feature
