Hi,
We had a looooong (too long, and it was pretty much due to me :) discussion about this on the SIP list. Please have a look at the archieve. To put it short: the reason is that if send the CANCEL before you receive a provisional response the CANCEL MAY actually reach the server BEFORE the INVITE does. Regards, Christer Holmberg Ericsson Finland "Arnold Lee." wrote: > > Hi all! > > in bis 5 9.1 Client Behavior > > The CANCEL request MUST NOT be sent if no provisional response > has been received, rather, the client MUST wait for the arrival of a > provisional response before sending the reqest. > > Why does it like that ? > > Can't it send CANCEL before receiving provisional the response ? > > Best Regard > ------------------------------ > Lee, Hee-suck (Arnold Lee) > MIP Telecom, Inc > Tel : +82-2-874-2300 > H.P : +82-16-729-1496 > E-mail : [EMAIL PROTECTED] > ICQ Num : 62188694 > MSN : [EMAIL PROTECTED] > ------------------------------ > > _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
