Re: nist-sip 1.2 and NAT traversal : issue with ListeningPoint sentby field

Oh I should add -- you can do a listeningPoint.setSentBy(... )
*before* you get a client Transaction

On Jan 16, 2008 2:30 AM, Brian Wyld <[email protected]> wrote:
> Hi,
>
> I've been using the NIST SIP stack, and recently updated to the latest
> version (note in passing, great job guys).
>
> However, my code to deal with calls that are outbound thru a NAT'd router no
> longer works.... If anyone can explain what I'm doing wrong it'd be a great
> help.
>
> Basically, I want to make calls out (send the INVITE) to destinations that
> may be either on an 'internal' network, or 'public' ie outside of a NATing
> router.
> There is no problem for the INVITE sending (using UDP), as the destination
> IP is routable in both cases. My code detects when the destination is going
> via NAT, gets the public IP of the router from a config file, and:
>        - adds a Via header accordingly
>        - fixes up the From, Contact etc URIs (change the local IP to the external
> IP)
>        - ensures the RTP SDP IP is the external IP
> This all worked fine until I updated to 1.2....
>
> Now, when I send to the public network, I get:
> javax.sip.TransactionUnavailableException: sentBy does not match the sentby
> setting of the ListeningPoint 62.212.123.79:5060
>        at
> gov.nist.javax.sip.SipProviderImpl.getNewClientTransaction(SipProviderImpl.j
> ava:304)
>        ... etc
> My external IP (in the Via, From, Contact etc) is 62.212.123.79 and my local
> IP (to which the ListeningPoint is bound) would have been 192.168.0.167
> (local server).
>
> So, when I create the ListeningPoint at initialisation of the server
> process, I tried setting the sendby using setSentBy() to  be the external
> IP...
>
> Now, it works when I send to an external destination, but not when I send to
> an internal one!
>
> Is there a way to stop the ListeningPoint checking its sentby field against
> my Via, From etc headers? Or is my basic method (fixing up the headers
> myself) wrong, and I should do it another way? Or do I have to use 2
> SipProvider instances, one for internal calls (sentby=192.168.0.167:5060)
> and one for externals (sentby=62.212.123.79:5060)? (this is not my preferred
> solution....)
>
> All ideas gratefully received....
>
> Brian
>
> [ Brian Wyld : Eloquant SA    ]
> [ Directeur technique         ]
> [ brian.wyld at eloquant.com  ]
> [ tel: +33 476 77 69 54       ]
> [ mob: +33 609 62 10 87       ]
> [ fax: +33 476 77 40 65       ]
>
>
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>



-- 
M. Ranganathan
"There are two ways to write error-free programs; only the third one
works." --  Alan Perlis
http://www.animenewsnetwork.com/encyclopedia/anime.php?id=1052