#43 State diagram clarifications

[Sean Sheedy]

My understanding is that the state diagram in Appendix
A is per-session, not per-client. However, this is not
explicitly stated. This should be made clear in the
description.

Errors within the media server (series 5xx) often leave
a stream in an unplayable, unrecoverable state in which
the client's only option is to tear down the session
and start over. This should be reflected in the state
diagram.

[Magnus Westerlund]

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This one is realted to bug report #500803

[Magnus Westerlund]

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The state machine has been updated and clearly represent a
RTSP session. The effect 5xx error codes may have has also
been clarified. A 5xx response is in general recoverable
from. But the server is allowed to terminate the session for
errors of unrecoerable nature. The client will detect this
when issuing another request to that session and receive a
454 (Session Not Found) as response.

[Magnus Westerlund]

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I hope that the resolution in the state machine chapter is
satisfactory. AS no comments on the resolution has been
given in the last year I hereby close the bug.