Re: [reSIProcate-users] Compatability with RFC2543 clients

[Andrew Wood <ajwood@xxxxxxx>]

It doesnt seem to, I cant see any stack errors being printed but the  
200 appears to be resent over and over which suggests it was never  
received.  The strange thing is Im also having problems with calls TO  
an ATA186, the outgoing invite is sent but then something and i dont  
know what causes the app to crash. Possibly its the incoming 180 i  
dont know. As I say it works fine with a Cisco IP phone but after all  
the problems Ive had Im a bit dubious.  All Im doing is as follows:

When Request received

Set Req line to top Route header
Remove top route header
Add Via with proxy IP
Add RR with proxy IP
Send outgoing request

When Response received:

Remove topmost Via (proxy IP)
Forward msg to address in new-topmost via.

WHat is it about RFC2543 messages thats different is it no branch in  
the Via?





On 10 Feb 2009, at 15:29, Adam Roach wrote:

> I'm pretty certain that the reason the 180 isn't being forwarded is  
> in the resip stack, not your code. I'd be curious to know whether  
> the 200 makes it through when the call is answered.
>
> /a
>
> Andrew Wood wrote:
> > Thanks Adam
> >
> > So its definately not a mistake Im making?
> >
> >
> > On 9 Feb 2009, at 23:34, Adam Roach wrote:
> >
> > > Andrew:
> > >
> > > I'm not sure how much work we're willing to do in the stack core  
> > > to accommodate 2543 clients. Even the IETF has moved on such that  
> > > significant new protocol extensions abandon backwards  
> > > compatibility. My inclination would be to leave this particular  
> > > resip behavior unchanged -- in fact, it's not clear to me that we  
> > > even could fix it without violating the request-forwarding rules  
> > > in draft-sparks-sip-invfix-02.
> > >
> > > If you have a CCO account, you can follow the instructions here to  
> > > upgrade your ATA to a somewhat less ancient version of firmware,  
> > > which should solve your problem:
> > >
> > > http://www.cisco.com/en/US/docs/voice_ip_comm/cata/186_188/2_15/english/administration/guide/sip/SIP88APC.html
> > >
> > > If you don't have a CCO account... post back to this list and see  
> > > if someone speaks up to help you out. ;-)
> > >
> > > /a
> > >
> > > P.S. Here's the technical explanation of what's going on: it looks  
> > > like this used to work until about SVN revision 6545 (August 2006)  
> > > -- it may have broken somewhat earlier than that, but it's hard to  
> > > tell. The code in SipMessage.cxx:374 has comments indicating that  
> > > returning an empty cid should cause the stack to simply forward a  
> > > response (presumably according to its via header field) -- but the  
> > > code that calls it from TransactionState.cxx:168 unceremoniously  
> > > discards the message instead. (At least, I think that's the code  
> > > path you're exercising -- turning debugging up to DEBUG for the  
> > > stack would confirm).
> > >
> > >
> > > Andrew Wood wrote:
> > > > Im trying to build a stric routing proxy using resip.
> > > >
> > > > Ive got it working with 2 Cisco IP phones fine, but Ive also got  
> > > > some old Cisco ATA186 which I dont think are RFC3261 compliant.
> > > >
> > > > Whenever one of these is involved in the call strange things  
> > > > happen.
> > > >
> > > > www.simple.org/notworking.html <http://www.simple.org/notworking.html 
> > > > > shows a sample message exchange between an ATA 186 (202@xxxxxxxxxxxxx 
> > > >  <mailto:202@xxxxxxxxxxxxx>) calling a Cisco IP phone (200@xxxxxxxxxxxxx 
> > > >  <mailto:200@xxxxxxxxxxxxx>) via the resip based proxy at  
> > > > 192.168.254.254.
> > > >
> > > > The called phone rings but the 180 appears to be disliked by  
> > > > resiprocate when its forwarded on.
> > > >
> > > > I suspect Im doing something wrong with the forwarding of either  
> > > > the INVITE or the 180 but for a call between two Cisco IP phones  
> > > > it works fine.
> > > >
> > > > Any ideas please
> > > >
> > > > Regards
> > > >
> > > > Andrew
> > > >
> > > > Recommends you try OpenOffice.org - I'm
> > > > Microsoft free, you too can be.
> > > >
> > > > ------------------------------------------------------------------------
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> > Andrew
> >
> > Recommends you try OpenOffice.org - I'm
> > Microsoft free, you too can be.
> >
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Andrew

Recommends you try OpenOffice.org - I'm
Microsoft free, you too can be.