[SIPForum-discussion] discussion Digest, Vol 148, Issue 9

Fri Jun 28 05:49:44 UTC 2019

Hey Guillermo,

As per RFC 3261 , Section 13.2.1
<https://tools.ietf.org/html/rfc3261#section-13.2.1> Creating the Initial
INVITE, PAGE 79, first statement

*"*If the initial offer is in an INVITE, the answer MUST be in a  reliable
non-failure message from UAS back to UAC which is    correlated to that
INVITE. For this specification, that is  only the final 2xx response to
that INVITE. That same exact answer MAY also be placed in any provisional
responses sent prior to the answer. The UAC MUST treat the first
session description
it receives as the answer, and MUST ignore any session descriptions in
subsequent responses to the initial INVITE."

Hence , it says that 183 Provisional response are considered as a final
answer and , not mandatory to send 200OK with SDP.

for any further clarification you raise concern.

regards,
Nitin Maru

On Fri, Jun 21, 2019 at 10:54 PM <discussion-request at sipforum.org> wrote:

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>    1. Re: SIP Flow with a 200OK(without SDP) to the INVITE (Zu?iga)
>
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 20 Jun 2019 18:21:54 +0000
> From: Zu?iga, Guillermo <Guillermo.Zuniga at cwpanama.com>
> To: AMIT ANAND <amiit.anand at gmail.com>
> Cc: "discussion at sipforum.org" <discussion at sipforum.org>
> Subject: Re: [SIPForum-discussion] SIP Flow with a 200OK(without SDP)
>         to the INVITE
> Message-ID:
>         <948388ccbbfa48ea8b8b4326257472a6 at CWP-JFR-EXC01.cwpanama.com>
> Content-Type: text/plain; charset="utf-8"
>
> Good,
>
> Thanks for that info.
>
> Regards,
> Guillermo
>
> De: AMIT ANAND [mailto:amiit.anand at gmail.com]
> Enviado el: Thursday, June 20, 2019 1:16 PM
> Para: Zu?iga, Guillermo
> CC: discussion at sipforum.org
> Asunto: Re: [SIPForum-discussion] SIP Flow with a 200OK(without SDP) to
> the INVITE
>
> Hey Guillermo,
>
> Since the offer is already answered in 183 it does not need to send SDP in
> 200OK. Although majority of devices send SDP in 183 and 200OK as well. But
> its not mandatory, look for offer answer model for more details. It asks
> answer to come in reliable response and since the 183 is followed by PRACK
> thus reliable response is maintained so SDP in 183 could be consider as
> final answer.
>
> Cheers
> Amit
>
> On Thu, Jun 20, 2019 at 10:39 AM Zu?iga, Guillermo <
> Guillermo.Zuniga at cwpanama.com<mailto:Guillermo.Zuniga at cwpanama.com>>
> wrote:
>
> Hi fellows,
>
> I would like to know the following:
>
> I am having the following flow and I would like to know if is a valid flow
> and if the remote SIPGW should be able to handle or complete this dialog
> when receive a 200OK without SDP to the INVITE.
>
> Flow:
> A ->INVITE with SDP
> B<-TRYING
> B<-183 WITH SDP
> A->PRACK
> B<-200OK TO THE PRACK
> B<-180 RINGING WITHOUT SDP
> B<-200OK WITHOUT SDP TO THE INVITE.
> A->ACK TO THE 200OK WITHOUT SDP TO THE INVITE.
>
>
> My question comes, cause I am having audio issue with the client is
> calling us and here I would like to know if could be related that I am
> sending the 200OK without SDP. Or he should be able to complete the dialog
> cause previous to the 200OK without SDP I sent a 183 with SDP?
>
> Please let me know any comments or where in the RFC I  can look for that
> describe this behavior.
>
> Regards,
> Guillermo
>
>
>
> Guillermo Zuniga
>
> Especialista de Soporte T?cnico
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> --
> Thanks
> Amit Anand
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> End of discussion Digest, Vol 148, Issue 9
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-- 
Thanks & Regards,
Nitin Maru
*MOBILE. *
*9904600076*

*SKYPE : nitinmaru at Hotmail.com*
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