See RFC 6337 section 2.3's open issue concerning 488. 

> -----Original Message-----
> From: [email protected] [mailto:sip-
> [email protected]] On Behalf Of Kamini
> Gangwani
> Sent: Wednesday, July 11, 2012 6:51 AM
> To: [email protected]
> Subject: [Sip-implementors] Query regarding PRACK offer rejection
> 
> Hi All,
> 
> What should be the behavior of UAS when a new offer received in PRACK
> is not acceptable?
> 
> Following is the behavior:
> UAC                                 UAS
> ---INVITE(Offer1)--->
> <---- 183 (Answer1)-
> --- PRACK (Offer2)---> (Not accepted by UAS)
> 
> How should it be rejected?
> Does any standards or RFCs says anything about this?
> 
> 
> Regards,
> Kamini


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