[SIPForum-discussion] question on PRACK

[Retesh]

Hi Raghul

It is allowed to send as many reliable provisional responses as required,
and their is nothing like 183 cannot be followed by 180.

There seems to be something wrong with SBC or with the contents of 180 (Rseq
or offer-answer).

Regards
Retesh



On Thu, May 12, 2011 at 4:27 AM, Raghul Prasanna <raghul82 at yahoo.co.uk>wrote:

>   Hello all,
>
> One of our carrier requires support for PRACK.
>
> When the carrier sends 183 Session Progress, we send PRACK and receive 200
> OK for the PRACK.
>
> Then they again send 180 Ringing and our SBC rejects the call.
>
> I believe we are right here to reject the call, because the carrier
> shouldnt be sending 180 ringing after receiving PRACK for 183 Session
> Progress. Please let me know.
>
> Also if possible please point me to any rfc which says PRACK to 183 should
> not be followed by 180.
>
> Thanks,
> Raghul
>
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-- 
With Regards
Retesh Chadha
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