[SIPForum-discussion] sip prack

[Keyur Amin]

In your scenario, check and see if there is RSeq value in 180 response. If the INVITE is sent with Supported: 100rel, and a provisional response doesn't send a RSeq value, the call should continue without reliable responses. If the 180 response does have a RSeq value, a PRACK needs to be sent with a RAck. Please refer to RFC 3262 for more details on how the reliable responses work. 
 
Thanks,
Keyur Amin

________________________________

 
 



On Thursday, November 21, 2013 11:01 AM, Loic ahnee <loicahnee at gmail.com> wrote:
 
http://www.iplogos.fr/English-Resources/Focus/sip-early-media-early-offer-en.html




2013/11/19 Rajendran Rajarajan <rajendranr7 at gmail.com>

Hi,
>
>Retransmissions of the reliable provisional response cease when a matching PRACK is received by the UA core.
>
>Try the same scenario after disabling PRACK.
>
>Regards,
>Rajendran R
>
>________________________________
> From: Zuñiga, Guillermo
>Sent: 19-11-2013 03:34
>To: discussion; Cordoba, Encarnacion
>Subject: Re: [SIPForum-discussion] sip prack
>
>
>Hi fellows.
>I would like to understand the following.
>I have the scenarios A call B.
>In the first invite I am seeing that include the header "Supported: 100rel" and then my GW is sending back a 180Ringing/SDP  with "Required: 100rel",  and after 7 more 180 my GW is killing the session with 504 Server Time Out.
> 
>Question:
>1-What means that "Supported: 100rel" in the first invite coming from the Peer?
>2-What means that "Required: 100rel" back in the 180 from my GW? What my GW are expecting receive from the Peer? Why is sending 7 more 180 to the Peers?
>3-Why then after a timer is killing the session with 504 Server Time out?
> 
>4-What could happen is don’t send back from my GW "Required: 100rel" in the 180, session could continue? What should send me Peer in this case?
> 
>Thanks a lot for all the feedback.
>Thanks
>Guillermo
> 
> 
> 
>Guillermo Zuniga 
>Especialista de Soporte Técnico 
>Gerencia de Soporte Técnico 
>Tel: +507 263-6671 
>Cel: +507 6670-0481  
>Fax: +507 265-3295 
>Email:  Guillermo.Zuniga at cwpanama.com 
> 
>
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-- 
Loïc AHNEE 
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Office : 403 41 12 
loicahnee at gmail.com

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