[reSIProcate] PRACK with late offer?

[Scott Godin]

This scenario should work.  If I'm understanding your scenario correctly
you are the UAC side and the UAS has provided it's offer in the 183
message.  You would need to call provideAnswer before the PRACK is sent out
by DUM.

Best Regards,
Scott Godin



On Mon, Mar 7, 2016 at 6:12 AM, Jan Granqvist via resiprocate-devel <
resiprocate-devel at resiprocate.org> wrote:

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> ---------- Forwarded message ----------
> From: Jan Granqvist <jan_granqvist at yahoo.com>
> To: "resiprocate-devel at resiprocate.org" <resiprocate-devel at resiprocate.org
> >
> Cc:
> Date: Mon, 7 Mar 2016 11:11:14 +0000 (UTC)
> Subject: PRACK with late offer?
> Hi all,
>
> I need some pointers on how to use 'PRACK'.
> We have been using the late offer model in some required cases with no
> problem.
> Now we will be connecting towards a SIP trunk that requires 'PRACK'. I've
> enabled 'PRACK' support and it works when providing an offer in the initial
> 'INVITE'.
> But I'm a bit at loss when trying to combine 'PRACK' support with late
> offer, what the call flow should look like.
>
> UAC                             UAS(Sip trunk)
>  |------------------INVITE---------------->|
>  |<---------------100 Trying--------------|
>  |<--183 Session Progress w/SDP--|
>  |<--183 Session Progress w/SDP--|
>  |<--183 Session Progress w/SDP--|
>  |-----------------CANCEL-------------->|
>  |<-----------------200 OK----------------|
>
> The initial 'INVITE' includes 'PRACK' support in the 'Allow' header and
> also '100rel' in 'Supported' header.
> The '183 session progress' includes header '100rel' in 'Require' header as
> well as a 'RSeq' header, but DUM doesn't respond with a 'PRACK'.
> While looking through the UASPRACKFlows.png (resip/dum/doc), scenario 1
> looks like what I'm looking for.
>
> What should the proper way be in this case? Is it possible to have this
> combination, 'PRACK' with late offer?
> I'm using version 1.10.0.
>
> BR
> /Janne
>
>
>
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