Paul E. Jones wrote:
Brian,
The problem with using "image" is that it would mean that a gateway would
have to do one of:
1) Close the audio session and open an image session
2) Open a second "image" session during mid-call
3) Open both an audio session and image session at the outset
The real underlying problem was that the idea of an "audio session" was
a design mistake.
Practice has shown that sessions consist of multiple media.
Unfortunately the IETF hasn't fixed that design mistake, so the ITU has
kluged around it with things like "audio/t34".
My opinion. And yes, the discussion of how to recover from that mistake
belongs in the RAI area.
Harald
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