Dear All,

I have a quick question:

Should a B2B Application Server wait for PRACK of a SIP 181, before sending
furture 181 messages ...

or is this scenario correct

AS1     AS2     AS3     AS4
 |       |       |       |
 |<------|       |       |
 |  181  |<------|       |
 |<------|  181  |<------|
 |  181  |<------|  181  |
 |<------|  181  |       |
 |  181  |       |       |
 |------>|       |       |
 | PRACK |       |       |
 |------>|       |       |
 | PRACK |------>|       |
 |------>| PRACK |       |
 | PRACK |------>|       |
 |       | PRACK |------>|
 |       |       | PRACK |


Best reagrds,
Harpreet Juneja
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