Hi,
I am looking for the clarification on the following
two requirements from the I-D Extension for Instant
Messaging(draft-ietf-sip-message-06):
A UAC MUST NOT initiate a new out-of-dialog
MESSAGE transaction to a given URI if there is a
previous out-of-dialog transaction pending for the
same URI.
Similarly, A UAC SHOULD NOT initiate overlapping
MESSAGE transactions inside a dialog, and MUST NOT do
so unless the route set for that dialog uses a
congestion-controlled transport at every hop.
Queries:
1. Why these requirements are MUST NOT instead of
SHOULD NOT as it is to reduce the
congestion-control
and not elimination of congestion altogether?
2. Does these restctions apply to the MESSAGE trans-
actions taking place in different dialogs but are
established between the same UAC and UAS? (The
intent again is to reduce the congestion by the
initiator).
Thanks in anticipation of replies.
Ravi.
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