Hi, >Hi, > >I have a question about "CANCEL" usage.. >When a caller wants to cancel the call, he sends "CANCEL" request to a >callee.. CANCEL is used when one wants to cancel a TRANSACTION, so in your case you would use it to cancel the INVITE if you haven't received a final response for it. >Is it possible to convey a "cause" parameter with CANCEL request?? >In some application like a PSTN Gateway , it is helpful to convey the >reason for canceling.. >According to "draft-ietf-sip-isup-00.txt", REL message may be included >in the CANCEL message body.. >I hope to find a way to convey a cause using a proper SIP header >field.. >Can anybody help me?? REL is mapped into a CANCEL if you haven't received the final response for your INVITE, otherwise you map it into a BYE. Note that you can also map it into BYE even if you have NOT received the final response yet. Regards, Christer Holmberg Ericsson Finland > > Thank you.. > > > +------------------------------------------+ > Jae-Min Ahn > Senior Engineer > > Contela, Inc. > 9-1 Sunae-dong, Pundang-gu, > Sungnam City, Kyunggi-do 463-784, Korea > Mobile: +82-11-9076-6104 > Tel: +82-342-601-5830~3 (ext:109) > Fax: +82-342-602-5830 > Email: [EMAIL PROTECTED] > +------------------------------------------+ >
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