[Sip-implementors] Client Behavior for CANCEL

[Arnold Lee.]

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] ------------------------------