[Kamailio-Users] DNS lookup for requests within dialog

[catalina oancea]

Hi again


I probably misunderstood the RFC. But an INVITE does create a dialog,
and the situation:

asterisk                        kamailio                provider(hostname)
         -------------------->    dns lookup     -------------------->
         INVITE 1                                 INVITE 1

        <--------------------                      <--------------------
         407                                          407

         -------------------->   dns lookup     -------------------->
        INVITE 2                                 INVITE 2
         (authenticated)


would have the same problem.

But the htable idea seems OK, I will try it.


Thanks everybody




2009/9/24 Klaus Darilion <klaus.mailinglists at pernau.at>:
>
>
> Daniel-Constantin Mierla schrieb:
>>
>> Hello,
>>
>> On 24.09.2009 12:10 Uhr, catalina oancea wrote:
>>>
>>> Hi,
>>>
>>> In my scenario kamailio is not a registrar, it's just a proxy
>>> forwarding requests from asterisk to the provider.
>>>
>>
>> I see.
>>
>> As Juha said, REGISTER does not create a real dialog, since the contact in
>> 200OK is the address of publisher not of destination. So a proxy does not
>> have within-dialog like routing information.
>>
>> So here is a hack you can try:
>> - add record route on your proxy
>> - the provider should add its own record route to REGISTER reply -- if it
>> is kamailio, that is simple via append_to_reply() from textops, just before
>> save() call.
>
> works only if the provider use Kamailio (in which case syncronized nonces
> shouldn't be a problem)
>
>> - hope/pray that asterisk is using these dialog info for building
>> re-registration messages
>
> I don't think that will work.
>
> klaus
>
>
>> - on your kamailio route based on Route header
>>
>>
>> Cheers,
>> Daniel
>>
>>>
>>> 2009/9/24 Daniel-Constantin Mierla <miconda at gmail.com>:
>>>
>>>>
>>>> Hello,
>>>>
>>>> On 24.09.2009 11:47 Uhr, catalina oancea wrote:
>>>>
>>>>>
>>>>> Hi all,
>>>>>
>>>>>
>>>>> I tested the following scenario:
>>>>>
>>>>> astreisk                        kamailio
>>>>>  provider(hostname)
>>>>>       -------------------->    dns lookup     -------------------->
>>>>>         REGISTER 1                              REGISTER 1
>>>>>
>>>>>        <--------------------                      <--------------------
>>>>>         401                                          401
>>>>>
>>>>>         -------------------->   dns lookup     -------------------->
>>>>>         REGISTER 2                              REGISTER 2
>>>>>         (same dialog, increased cseq)
>>>>>
>>>>>
>>>>>
>>>>> It seems that kamailio does dns lookup again when receiving REGISTER
>>>>> 2, although both registers are part of the same dialog. Is this the
>>>>> expected behavior?
>>>>>
>>>>>
>>>>>
>>>>
>>>> IIRC now, there is no place in registrar related modules (registrar and
>>>> usrloc) where DNS query is done. You have some checks in your config
>>>> that
>>>> caused that.
>>>>
>>>> There is also an option to fetch existing contacts from location and see
>>>> if
>>>> it is an update (matching by call id and cseq) and do directly
>>>> save("location").
>>>>
>>>> Cheers,
>>>> Daniel
>>>>
>>>> --
>>>> Daniel-Constantin Mierla
>>>> * Kamailio SIP Masterclass, Nov 9-13, 2009, Berlin
>>>> * http://www.asipto.com/index.php/sip-router-masterclass/
>>>>
>>>>
>>>>
>>>
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>>>
>>
>