Who is Who
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Phones are SIP User Agents that can initiate (client) or accept (server) sessions
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eg: a phone calls a number, or answers an incoming ring
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OpenSIPS is a SIP Proxy and Registar
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eg: it routes the signaling from User Agents
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eg: it knows ehre the phones actually are
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eg: never touches the media
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FreeSWITCH is a SIP B2B User Agent, client and server at same time
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eg: it connects two sessions, one as server, one as client
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eg: it answers a call incoming from a "client" phone, then initiate a call toward a "server" phone, then joins
(eg bridges) the two calls
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eg: it mixes the media from the two sessions, the two phones talk to each other and interact with FS at the
same time
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eg: it knows if media is flowing or not (missed BYE anyone?)
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eg: it can mix media with itself (phone talk with IVR)
