[reSIProcate] How the UAC reacts to the 200OK(invite) prior to sending the PRACK for the 18x response?

[alexzhang at gdnt.com.cn]

Hi All,
 
In my case, the UAC implementation is divided to 2 seperate process, in
which on is responsible for the SIP Statck, the other is the Transaction
User. When UAC receives the 180 Ringing message without SDP, the Stack
passes it to the transation user after the parsing and the transaction
processing. While then before the Transaction User decides to build the
PRACK messag for the 180, the Stack receives the 200OK(invite) from the
UAS. The stack then passes this 200OK to the msg queue which is used to
communicate with Transaction User. Afterwards, the Stack got the PRACK
message from the Transaction User and start to build the PRACK message
which is to be sent back to UAS. Now, because the Dialog state is
already set as Confirmed, so, how should I handle this PRACK message.
Should I Consume the PRACK which is not so necessary to UAS or still
need to send it out?
 

Alex Zhang
Guangdong Nortel (GDNT) R&D Center
GSM/UMTS Voice Core - MSC Design  


 
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