So if we say OpenSIPs is the load balancer that directs traffic (call flow) along the road which is the Internet…where does all that traffic get directed towards? You guessed it. FreeSWITCH.
FreeSWITCH is a media server. Think of a media server as being similar to a language translator between two people who speak two completely different languages. In its simplest form, a media server takes audio from one person, processes it, and passes it on to another person. It also provides translation services, meaning if one person “talks” another language it can convert that language on the fly to something the other party can understand.