[SIPForum-discussion] Is the non-2xx final response before the PRACK of the previous provisonal response allowed?

[alexzhang at gdnt.com.cn]

Hi, Here I am wondering if this scenario can be compliant the SIP
protocol?
 
UAC                                 UAS
   --------- Invite -------------->
   <--------100 Trying---------
   <---------183 SP -----------
                                  something happened
                                  before the PRACK
   <---------4xx failure--------
 



Alex Zhang
Guangdong Nortel (GDNT) R&D Center
GSM/UMTS Voice Core - MSC Design  
Phone: (PSTN)+86 020 89188782 (ESN)6 554 8782 
E-mail: alexzhang at gdnt.com.cn <mailto:alexzhang at gdnt.com.cn>  YahooIM:
zcc_nuaa 

 
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