FreeSWITCH 是一個電話的軟交換解決方案，包括一個軟電話和軟交換機用以提供語音和聊天的產品驅動。FreeSWITCH 可以用作交換機引擎、PBX、多媒體網關以及多媒體服務器等。
FreeSWITCH 支持多種通訊技術標準，包括 SIP, H.323, IAX2 以及 GoogleTalk ，可以方便的與其他開源的PBX系統進行對接，例如 sipX, OpenPBX, Bayonne, YATE 或者 Asterisk.
FreeSWITCH 支持許多高級的 SIP 特性，例如 presence/BLF/SLA 、TCP TLS 和 sRTP，它還可以用來作為類似于 SBC (Session Border Controller) 的透明代理。
FreeSWITCH發布，改進內容包括：
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.
