PRACK can contain OFFER & ANSWER, whereas ACK cannot. Thus, they cannot be treated equally. Hari On Mon, Jan 16, 2012 at 4:25 PM, Alain Totouom <alain.totouom at gmx.de> wrote: > Hi Rahul, > > On 16-Jan-12 09:00, rahul yadav wrote: > > If i see it in this way: "ACK is used to stop re-transmission of 200 ok. > > Similarly PRACK is used to stop re-transmission of provisional > responses". > > So both should be treated equally ? > > > > No. > The finality may be the same but different rules are used. > > ACK is part of the INVITE-Transaction. > PRACK is "a" normal SIP message like BYE, therefor > Non-Invite-Transaction rules are used... > > > Sorry for my ignorance, i am still not clear why PRACK needs 200 ok ? > > > > As stated previously PRACK is a new transaction which comes to > completion i.e. when its final response (200) is received... > > Cheers, > Alain > > -- > "" > (o)(o) > _____o00o__(__)__o00o_____ > 3072D/146D10DE 2011-09-29 Alain Totouom <totouom at gmx.de> > PGP Fingerprint 39A4F092 FFA7C746 CC305CB0 69091911 146D10DE > > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip at lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20120116/b62cb07f/attachment.html>
