Subject: RE: [Sip] querry about PRACK

From: "Christer Holmberg (JO/LMF)" <[email-masked]>
Date: Tue, 27 Sep 2005 11:26:56 +0200

Hi,
 
The standard does say that each transaction is independent from each other, but I guess it's also pretty much an implementation issue.
 
Please remember the following, though:
 
1. If you include some important information in the PRACK, you won't know it has arrived until you get the 200 OK.
 
2. If the remote user does not receive the PRACK, he/she may e.g. choose to release the call, or something else...
 
Regards,
 
Christer
LM Ericsson

-----Original Message-----
From: [email-masked] [mailto:[email-masked]]On Behalf Of ayan
Sent: 27. syyskuuta 2005 11:29
To: [email-masked]
Subject: [Sip] querry about PRACK

hi,
 
in a 3gpp call flow session establishment scenario.
if we receive the 200 Ok for the INVITE and send the ACK,
before we receive a 200 OK for PRACK that we send for 180 Ringing,
we keep retransmitting the PRACK until we receive a 200 OK for it.
 
but from an application stand point once we've acknowledged the 200 Ok for invite,
we needn't retransmit PRACK.
is there any way we can stop it and yet comply with 3261/3262?

thnx in advnce.
/ayan

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