Tilghman Lesher wrote:
Doesn't IAX2 support transfer of images (GIF, JPG, etc)? If so, how
is that handled?
They're encoded in mini-frames, as part of the media exchange, not in
full frames.
Well, that's not completely true. There are a couple different ways this is
handled.
The first is for a call which is exchanging video. These video frames are sent
in meta video frames (slightly different encoding than mini frames). However, a
full frame of type VIDEO must be sent every 65536 ms due to re-sync the
timestamps due to wraparound. This is because voice mini frames and video meta
frames carry a 16-bit timestamp, while the full timestamp is 32-bits, and is
only sent in full frames.
Also, there is an IMAGE full frame type which is used to send a single image
within an existing call. If anyone ever used gnophone and remember how it would
send a single picture of you to the other party in the call, this is how the
image would be sent.
--
Russell Bryant
Software Engineer
Digium, Inc.
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