I know that the RFC doesn't specify if CANCEL is or not allows within the dialog - there were also some discussions on the sip-implementors mailing list about how to handle a CANCEL within the dialog. Anyhow, IMHO, even if allowed, CANCEL within the dialog makes less sense - to be honest I saw no implementation doing something like this.

Now, back to the original subject: as Anders describe his problem, is definitely not the case of a within the dialog CANCEL and we should come up with some hints relevant to his case and avoid confusing the guy more than necessary ;).

And regarding the t_relay() and CANCEL - there is no need to apply same RURI transformations as for INVITE - TM saves the INVITE outgoing RURI; when CANCEL comes, it is matched with an INVITE and the RURI for CANCEL is automatically taken from the INVITE transaction.

regards, Marian Greger V. Teigre wrote: > Hi Marian! > > Marian Dumitru wrote: > >> CANCEL has nothing to do with loose route - and it will never hit he >> loose route. The Route ser is set only when the dialog is >> established (200 ok); and CANCEL happens *before* the dialog >> completion. The big idea with CANCEL is to take care to route it >> *exactly* as >> its INVITE. > > > > > AFAIK, CANCEL can happen both in-dialog and outside a dialog. This > was a part of the verification we did when developing the ONsip.org > reference config filers. I'm not sure if the discussion was on > serusers or not, but as far as I remember, there is situation where > CANCEL will be in-dialog and thus can take the loose route path, > i.e. reINVITEs. As you will see in the ONsip.org config files, > CANCEL is handled as > an INVITE, but loose route test is done *before* the test on CANCEL > to make sure that any in-dialog CANCELs are handled properly. > >> As a hint, if you use TM, t_relay() all the time will take care to >> send the CANCEL to same destination as INVITE. > > > > > ... as long as you have done the same r-uri transformations as with > the INVITE. > g-) > >> regards, >> Marian >> >> Greger V. Teigre wrote: >> >>> Most likely you don't handle the CANCEL messages correctly. May be >>> that you don't do proper loose route handling. Take a look at the >>> example configs (and the Getting Started document) at >>> http://onsip.org/ You gain much be following the logic found >>> there, they have been verified for all kinds of situations... >>> g-) >>> >>> Anders Hansson wrote: >>> >>>> Hi all, >>>> I´ve got a problem when trying to cancel an invite. >>>> The situation: A makes a call to B (INVITE). B press the "hang up" >>>> button. An here comes the problem. >>>> From As side, everything is OK, but from Bs side, the phone is >>>> still ringing... >>>> How can a solve this problem? Anyone? >>>> >>>> Thanks, >>>> Anders >>> >>>