I've been reading some stuff SIP related, and I'm confused, about what is a SIP back-to-back user agent(B2BUA) and a 'normal' user agent?
Can anyone explain the differences?
From what I read I can't differentiate a B2BUA from a UA... For me a UA acts as a UAS (User Agent Server) when needs to answer a request, and as a UAC (User Agent Client) when needs to send a request..
But I can't understand how different a B2BUA is..
Sorry if this doesnt make sense, but I'm a little bit confused