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

All,

setSentBy() makes most sense if you want to set a FQDN (i.e. hostname) 
in the Via header. This can be used to support failover for responses 
(through DNS)

Setting it to a specific IP address does not help, as the SIP protocol 
is designed to send back responses to the IP address from which they come

Regards,
jeroen

M. Ranganathan wrote:
> 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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>>
> 
> 
>