hanifa.mohammed wrote:
Hi,
1. Only one INVITE request may be pending within a dialog. Else, 491
will be sent.
2. Only one non-INVITE request may be pending within a dialog (in one
direction): it is not possible to send UPDATE if no final response has
been received to PRACK.
Pl clarify whether the above points are right. Esp, the second point.
It is possible to have more than one non-invite transaction in progress,
but it is usually unwise.
If they get out of order, so the 2nd arrives before the first, then the
first will be rejected with a 500 response. There are a few cases where
this is acceptable. But in most cases you would be well advised to
restrict to one transaction at a time.
Paul
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