[SIPForum-discussion] : Invite Cancel Response sequence

[chethan prakash]

Hello All,

Can you please kindly clarify if there is anything wrong the below mentioned
INVITE Cancel Response Sequence,

UE 1                                    UE 2
    --------------INVITE----------------->
    <---------- 100 Trying---------------
    <---------- 180 Ringing-------------
    -------------CANCEL---------------->
*    <---------- 487 (INVITE)------------*
*    <---------- 200 OK (CANCEL)----*

Please forward me the RFC Section where it is stated that on receiving
cancel we should respond to Cancel Request first before we send final
response to Invite Request.


Regards,
Chethan
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