Hi,

I have an issue and I can't identify if the behaviour is wrong:

Here is a working call
Provider               Customer
SBC                        SBC
INVITE (SDP offer)-->
<--100 Trying
<--180 Ringing (SDP answer)
PRACK -->
<-- 200OK (PRACK)
<-- UPDATE
200OK UPDATE -->
<--200OK (INVITE)
ACK -->

And here is a failed call
Provider               Customer
SBC                        SBC
INVITE -->
<--100 Trying
<--180 Ringing (SDP)
PRACK -->
<-- 200OK (PRACK)
<-- UPDATE
<--200OK (INVITE)
200OK (UPDATE) -->
ACK -->
BYE -->
<--200OK (BYE)

In the failed call I am being told by the provider that their SBC sent a BYE 
because the 200OK for the INVITE was received before it managed to send the 
200OK for the UPDATE, I have checked the RFCs and can't find if the customer 
SBC is breaking any rules by sending an 200OK for the INVITE before it received 
a response for the UPDATE

Any assistance is appreciated

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