[OpenSIPS-Users] lookup() questions

[OCEANET - Cédric BASSAGET]

Hello Răzvan,

Thanks for your reply.
Yes, I'm sure i'm tracking udp trafic, I can see SIP options for example.
I've found my error, and it's a big one : I was doing "exit" in my 
switch() statement, instead of "break". So t_relay was never called... 
No comment...

So the lookup function seems to work correctly, but it does not do what 
I expect.

What I want is just to send SIP requests to UAC behind NAT on the good 
udp port (ex : 1025, corresponding to the "received" field in usrloc). 
Actually (when not using lookup() ), requests are sent to port 5060, 
whatever the value of "received" field is. But I don't want to change 
user and domain part of RURI, just adjust the port.

With lookup() function :
incoming INVITE RURI : sip:0970559986@<the IP of my SBC>:5060
INVITE RURI after lookup (to my UAC) : sip:2015@<the IP of my UAC>

invite is relayed to udp port 1025, which is a good thing. But username 
has been changed, and I don't want that.

Without lookup() function, invite is relayed to port 5060, so my 
router/nat doesn't route it correctly -> nothing works.

Don't hesitate to ask if this is not clear. I don't know where to look 
for, usrloc seems to be good, but is not used well...

Should I do a mysql query to extract the port of the "received" in 
usrloc, and then play qith $dp and $rp ? I think there is something 
simpler than that, but I can't find it.

I hope somebody can help me ...!
Regards,
Cédric






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On 24/10/2014 20:15, Răzvan Crainea wrote:
> Hi, Cedric!
>
> The third version is the correct version you should use, if the R-URI 
> is different than the AOR you are looking for.
> Are you sure that your tcpdump trace is tracking the UDP traffic? Are 
> you sure there are no errors generated by t_relay()? Do you see 
> t_relay DBG lines in the logs?
>
> Best regards,
>
> Răzvan Crainea
> OpenSIPS Core Developer
> http://www.opensips-solutions.com
>
> On 10/24/2014 02:31 AM, OCEANET - Cédric BASSAGET wrote:
>> Hello,
>>
>> I'm actually trying to resolve NAT issues with opensips, and I have a
>> problem using lookup() function.
>>
>> UAC register to my opensips server. When UAC is behind nat (detected
>> with nat_uac_test()), I do a "fix_nated_register()" and 
>> save("location").
>> My usrloc table looks correct, I have a line with (important fields):
>> - a username = 2015 (sip trunk identifier)
>> - a domain = the domain my UAC is registering to (= the domain my
>> opensips is listening on)
>> - a contact = sip:2015@<the IP of my UAC>
>> - a received = sip:<the IP of my UAC>:<port> (in my tests, port=1024)
>> - and many other fields (...)
>>
>> When trying to relay an incoming INVITE to this UAC, if I understood
>> well, I have to do a "lookup()" before t_relay, to tell opensips to send
>> the request to the "usrloc.received" <address:port>.
>>
>> I've tried couple things, like :
>> - lookup("location") -> $ru is totally different from what we are
>> looking for, so it does not work, that's normal
>> - lookup("location","","2015@<domain>") -> got an error :
>> ERROR:core:parse_uri: bad uri,  state 0 parsed: <2015> (4) /
>> <2015 at domain> (37)
>> - lookup("location","","sip:2015@<domain>") -> $retcode=1, and debug
>> shows me this :
>>
>> DBG:registrar:lookup: found a complete match
>> DBG:registrar:lookup: setting as ruri <sip:2015@<the IP of my UAC>>
>> but nothing goes out to ip address of my UAC... (tcpdump).
>>
>> Can somebody tell me if I've correctly understood how lookup() function
>> works ? Or if I'm doing totally aberrant things ?
>>
>> Regards,
>> Cédric
>>
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>
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