A SIP phone *could* normally send its media stream directly from phone to
phone, if no transcoding is required, but when using Asterisk the media
stream will always pass through the server, causing a pottential bottleneck.
So, why not use SER to register all the SIP phones, as it doesn't handle the
media-streams, just keeps track of the phones and does the 'handshake'.
SER is supposed to be able to handle over 50.000 calls at a time, so one SER
server would be enough.
Then interface this with one (or more) Asterisk servers to connect to the
local PSTN.
But maybe I'm missing something fundamental, in which case I'm happy to learn.
Um, Wrong, You can do re-invites and have the media go point-to-point, We do it all the time.
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