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 ? Sorry for my ignorance, i am still not clear why PRACK needs 200 ok ? > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20120116/e1003a7e/attachment.html>
