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Re: [reSIProcate-users] 200OK with Offer in UAC "EarlyWithAnswer" state


Hi Scott:
I had read that PRACK support is only completed for the client side, but I thought that DUM is the client in the scenario that I layed out. 


On Fri, 31 Aug 2007, Scott Godin wrote:


PRACK support in dum is only completed for the client side (ie.
responding to a PRACK request).  Support for sending a PRACK via dum has
not yet been completed.

Scott


-----Original Message-----
From: resiprocate-users-bounces@xxxxxxxxxxxxxxxxxxxx
[mailto:resiprocate-users-bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf Of
Michael Trank
Sent: Friday, August 31, 2007 10:34 AM
To: resiprocate-users@xxxxxxxxxxxxxxxxxxxx
Subject: [reSIProcate-users] 200OK with Offer in UAC "EarlyWithAnswer"
state



Friends:

I am having a problem with sessions using DUM connecting to a gateway
manufactured by Sonus. Not sure of the model number, but the SDP
packets
say "Sonus_UAC".

My sessions look like the following:

               DUM                                       GATEWAY
         INVITE ( no sdp, Supported: 100rel )            ------->>
         100 Trying                                      <<-------
         180 Ringing ( with sdp offer, Requires 100rel ) <<-------
         PRACK ( with sdp answer )                       ------->>
         200 OK ( for the prack, no sdp )                <<-------

At this point i hear the ringback from the telephone network through
the
gateway.

But the next thing that happens is the remote telephone gets answered.

         200 OK (for the invite, *with* sdp offer )      <<-------

When the GW sends this 200 OK with a new offer, DUM shuts everything
down,
and the onFailure callback gets called.

         ACK ( no sdp )                                  -------->>
         BYE                                             -------->>


I looked at the state machine, and I think the relevant state
transition
for that 200 OK with the offer  is the following:

EarlyWithAnswer -> Terminated           [ label =
"on2XX-sdp/send::ACK,send::BYE,app::onFailure,app::onTerminated" ];

So, DUM is doing what is documented. DUM seems to think that what the
gateway is doing is *bad* SIP. But it seems to me that DUM could
transition to
the "Answered" state, and send a new answer in the ACK with
provideAnswer(),
and all would be well. Does anyone have any idea why
DUM shuts down for on2XX-sdp in the EarlyWithAnswer state?




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