[RTW] Realtime communication over HTTP (Re: Baseline in or out of scope)

[Bernard Aboba]

> The Google Talk numbers I've seen published elsewhere are that ~5-10% of
> sessions run over TCP, relayed through a server, because UDP doesn't get
> there.
>
>
[BA] On Live Meeting, it is quite frequent for at least one user in a
conference to require a non-UDP alternative.  Where UDP outbound is not
allowed, we are finding that often TCP outbound is not allowed either, and
only HTTP (and sometimes not even HTTPS) will work.



> The reasons to prefer point-to-point UDP if possible include:
> - Much lower delay when the endpoints are close to each other, network-wise
> - Much cheaper provisioning for the service provider
>

No argument.  It doesn't make sense to prefer TCP or HTTP transport if UDP
is available.
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