Hi, You probably want to have a look at the SIP-ISUP draft: http://www.ietf.org/internet-drafts/draft-ietf-sip-isup-00.txt Regards, Christer Holmberg Ericsson Finland Jae-Min Ahn wrote: > > Thank you for your attention.. > > I agree with you that REL can be mapped into a CANCEL.. > But I want to find a way to convey REL "cause parameter" with CANCEL message.. > In RFC 2543 and some related drafts, I could not find a SIP header which can >properly convey a "cause" value in CANCEL request.. > > Does anybody have an idea on this?? > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of > Christer Holmberg > Sent: Tuesday, March 27, 2001 8:22 PM > To: [EMAIL PROTECTED] > Cc: [EMAIL PROTECTED] > Subject: Re: [Sip-implementors] Question about CANCEL usage.. > > > > 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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