RE: [reSIProcate] DUM: Cancelling client session in initial state

["Derek MacDonald" <derek@xxxxxxxx>]

DialogUsageManager::send modifies the sip message in-place, so the CANCEL
transaction id does match. Dmitry's reference vs copy explains you
behaviour.
> 
> I thought the reason was:
> 
> In DialogUsageManager::send()
> 
>    if (msg.header(h_RequestLine).method() != CANCEL &&
>        msg.header(h_RequestLine).method() != ACK &&
>        msg.exists(h_Vias))
>    {
> 
> msg.header(h_Vias).front().param(p_branch).reset();
>            ^^^^^^^
>    }
> 
> For example, if the initial DUM created INVITE's
> branch is BranchA, after this function, the branch is
> changed to BranchB and passed to transaction layer. In
> transaction layer, the transaction ID is BranchB. But
> for CANCEL message created in DUM, the branch is still
> BranchA. So transaction layer cannot find the
> corresponding INVITE transaciton!!!
> 
> Can anyone explain why the branch parameter is reset
> here? Thanks,
> 
> kaiduan
> 
> 
>  --- Dmitry Semyonov <dsemyonov@xxxxxxx> wrote:
> > On Fri, 5 Nov 2004, Dmitry Semyonov wrote:
> >
> > > DUM does not send CANCEL request when I call end()
> > method of
> > > ClientInviteSessionHandle. Also note the empty
> > Contact AOR of the
> > > scheduled CANCEL request. I use r3433 based
> > reSIProcate, and
> > > process(fdset).
> >  [...]
> >
> > Well the described behavior was caused by using
> > SipMessage instance
> > instead of reference to it:
> >
> > <           SipMessage is_msg =
> > m_pDum->makeInviteSession( dstAor, FromAddr,
> > ---
> > >           // Warning! Using SipMessage instead of
> > SipMessage& here will result
> > >           // in wrong transaction Id!
> > >           SipMessage &is_msg =
> > m_pDum->makeInviteSession( dstAor, FromAddr,
> >
> > --
> > ...Bye..Dmitry.
> > _______________________________________________
> > resiprocate-devel mailing list
> > resiprocate-devel@xxxxxxxxxxxxxxxxxxx
> >
> https://list.sipfoundry.org/mailman/listinfo/resiprocate-devel
> >
> 
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