[SIPForum-discussion] SIP Flow with a 200OK(without SDP) to the INVITE

[AGHARA JUBIN]

Hi Guillermo,

It all depends on the implementation of SIPGW. And as we all know SIP has
remained quiet non standard across vendor and that's where SBC came into
picture.

I have worked with couple of them and most of them use 183 for Early Media,
e.g. Ringtone, MoH, Caller tune etc. SDP in 200OK is still expected for
actual speech codecs for speech path.

You can get more info on this RFC  4566 and 3264.

Take care!
Jubin



On Thu, 20 Jun, 2019, 11:09 PM Zuñiga, Guillermo, <
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 Técnico
> Gerencia de Soporte Técnico
>
> P: +507 263-6671 | +507 6670-0481
> E: Guillermo.Zuniga at cwpanama.com |W: www.cwpanama.com
>
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