"BandwidthU: How does FreeSWITCH primarily differ from Asterisk? Anthony: “The biggest difference is that FreeSWITCH is a bit more modular than Asterisk. That is to say that FreeSWITCH is broken into much smaller pieces, which means you can hook into more things and combine several small components into exactly what you are trying to accomplish. From a higher perspective, the most obvious difference is that Asterisk is labeled as and designed to be primarily a PBX where FreeSWITCH is a soft-switch which is a lower level of abstraction on the telephony totem pole meaning you can use FreeSWITCH to create a PBX if you wish but you can just as easily use it for several other duties such as SBC or application media server.”" - Arnaldo M Pereira from Bookmarklet