On 6/28/2011 6:46 PM, Nauman Sulaiman wrote:
> Hi,
>
> After OA is complete is it possible for UAS to send more 18x responses (with 
> no offer or answer of course).

YES.

>         UAC               UAS
>         |----INVITE------>|
>         |                 |
>         |<----1xx (o)-----| - provisional responses with REQUIRE 100rel
>         |                 |
>         |-----PRACK(a)--->| - send PRACK with answer
>         |<---- 2xx--------|                 |
>         |                 |
>         |                 |
>         |<----18x --------| - is this 18x allowed even though OA complete?
>         |                 |
>         |-----PRACK------>|
>         |<----2xx---------|
>
>              200OK
>         <-----------------
>         ------------------>
>              ACK
>
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