[SIPForum-discussion] PRACK Messages after the 180

[qcorba]

1. Whether PRACK needs to be sent depends on attribute "100rel required" in
18x.

2. SDP rtpmap 18 is G.729.

Zuñiga, Guillermo <Guillermo.Zuniga at cwpanama.com> 於 2014年4月25日星期五 寫道：

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> Hi fellows,
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> I am having the following issue with a peer carriers conected to my GW.
>
> The scenario is the following, a call with a Invite which header 100rel,
> then the carrier response with 183 session progress and 180 Ringing,
>
> I was reading the RFC3262 and I am not pretty sure of the following:
>
> 1-Is strictly necesary that GW send a PRACK messages of the 180, before
> send any other messages in this case a UPDATE?
>
> 2- Could be that our GW is sending this UPDATE messages cause the peer is
> sending us in the 183 SDP Media Attibute information the Media Format value
> = 18 like [Unknown]?
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> Attach files with info.
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> Regards,
>
>
>
> *Guillermo L. Zuniga C.*
>
> Support Engineer & VoIP Specialist | e-mail:guillermo.zuniga at cwpanama.com<javascript:_e(%7B%7D,'cvml','e-mail:guillermo.zuniga at cwpanama.com');>
>
> Fix Phone: +5078307365 | MSN IM: glzc at hotmail.com<javascript:_e(%7B%7D,'cvml','glzc at hotmail.com');>
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> Mobile: +507 66700481
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> *www.cwpanama.com* <http://www.cwpanama.com/>
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>
> Guillermo ZunigaEspecialista de Soporte TécnicoGerencia de Soporte Técnico
>
> Tel:+507 263-6671Cel:+507 6670-0481 Fax:+507 265-3295Email:
> Guillermo.Zuniga at cwpanama.com<javascript:_e(%7B%7D,'cvml','Guillermo.Zuniga at cwpanama.com');>
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