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

[Paul Kyzivat]

On 6/20/19 11:26 AM, Zuñiga, Guillermo 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.

Yes. Please see RFC6337 section 3.1.1.

	Thanks,
	Paul

> 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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