Re: [reSIProcate-users] B2BUA and TLS transport

[Byron Campen <bcampen@xxxxxxxxxxxx>]

	To make it explicit, ignoring the Contact header in INVITE/UPDATE in  
favor of the connection info established in a REGISTER request breaks  
target refreshes; ie, if a client sends you an UPDATE or reINVITE with  
a different Contact header (because it is about to change ip-address  
or port), this change will be ignored. This is breaking spec,  
technically speaking.

Best regards,
Byron Campen

> Support for this type of functionality was recently added to repro
> (outbound support).  If you are using DUM ServerRegistration then the
> ContactInstanceRecord contains a mReceivedFrom member.  Looks like you
> would also need to enable InteropHelper::getRRTokenHackEnabled() in
> order to get the mReceivedFrom set.  mReceivedFrom can then be used to
> route (Invite) requests to this registered user by calling
> sipMsg->setDestination(contactInstanceRecord->mReceivedFrom).
>
> Note:  You will probably want to ready the comments in
> ServerRegistration::dispatch first, it contains warnings about doing
> what you want to do.
>
> Byron - feel free to correct any errors in my analysis.  : )
>
> Scott
>
> On Tue, Sep 9, 2008 at 2:20 PM, Dario Bozzali
> <Dario.Bozzali@xxxxxxxxxxxxxxxxx> wrote:
> > Hello,
> > I'm trying to write a B2BUA (it should work also as a registrar)  
> > using
> > DUM. Using UDP transport now I'm able to register UAs to B2BUA and to
> > send/receive calls between UAs through B2BUA. I'm facing some  
> > problems
> > using TLS transport (I suppose that it will be the same using TCP
> > transport, but I haven't tried yet) since it's not clear to me how to
> > reuse the connection opened by UA on REGISTER to send INVITE/ACK/BYE
> > etc. messages from B2BUA to UA. My B2BUA now is able to receive  
> > REGISTER
> > messages using TLS transport, but if B2BUA uses the Contact address
> > received on REGISTER message to send INVITE then a new connection is
> > opened.
> > Should I use rport parameter value received with REGISTER to  
> > override UA
> > Contact information? Should I set INVITE target address using
> > SipMessage::setDestination() or Tuple::mFlowKey? Do you know if any
> > sample code is available?
> > Any help would be appreciated. Thank you in advance.
> > Dario.
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