FreeSWITCH 是一个电话的软交换解决方案，包括一个软电话和软交换机用以提供语音和聊天的产品驱动。FreeSWITCH 可以用作交换机引擎、PBX、多媒体网关以及多媒体服务器等。   FreeSWITCH 支持多种通讯技术标准，包括 SIP, H.323, IAX2 以及 GoogleTalk ，可以方便的与其他开源的PBX系统进行对接，例如 sipX, OpenPBX, Bayonne, YATE 或者 Asterisk.   FreeSWITCH 支持许多高级的 SIP 特性，例如 presence/BLF/SLA 、TCP TLS 和 sRTP，它还可以用来作为类似于 SBC (Session Border Controller) 的透明代理。   FreeSWITCH发布，改进内容包括：   WebRTC complete with support for Opus, DTLS and more Decoupling of the RTP Stack from SIP Removal of several in tree third party libraries and many updates related to this change means new support libs from SQLite, OpenSSL, an more. A large number of security and stability improvements that have been found by making FreeSWITCH compile with various compilers and by reviewing the code base with Coverity.