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

[Zuñiga, Guillermo]

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: Zuñiga, 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 Zuñiga, 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 Técnico

Gerencia de Soporte Técnico


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Thanks
Amit Anand

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