[OpenSIPS-Users] B2BUA tests

[Jeff Pyle]

Hi Anca,

Please let me know if my train of thought makes sense.

I have a functional traditional proxy configuration where packets are
forwarded with t_relay, loose_route, etc.  If I wanted to convert this to a
topology hiding B2BUA in Opensips, I would replace the t_relay of the
initial INVITE with a b2b_init.  That way, instead of statefully relaying to
the UAS, I would be establishing a new dialog in B2BUA mode.

Am I on the right track?  Would I need to do anything to the current
loose_route section, or would all dialogs be translated automatically
without any modification?


- Jeff



On 10/28/09 4:48 AM, "Anca Vamanu" <anca at opensips.org> wrote:

> Hi Jeff,
> 
> I have completed the documentation on
> http://www.opensips.org/Resources/B2buaTutorial#toc12 with some schema.
> What happens in topology hiding is that the B2BUA starts a new dialog
> with the other party, so it will first send an INVITE message. Now, if
> you call b2b_init before you do lookup location and the target address
> is has in the domain part the domain of your sip proxy, then the INVITE
> will get back to the server and back in the script. For this case I was
> saying that you should not require authentication for it.
> And no, the B2BUA component does not have any type of authentication of
> its own, it only knows to put itself in the middle of the call and
> establish two dialogs, with each party.
> 
> Regards,
> Anca
> 
> 
> 
> Jeff Pyle wrote:
>> Anca,
>> 
>> Does the B2BUA module have some type of authentication on its own?  Is it
>> looping back to the top of the script and trying to authenticate itself, and
>> that's where your suggestion comes from?  Or something else?
>> 
>> It appears I don't have a good understanding of the message flow through
>> Opensips in a B2BUA'd session.  At b2b_init time, does something return to
>> the top of route[0] and start over?  As such should I run b2b_init as close
>> to the top of route[0] as possible?
>> 
>> If you could help me understand what happens to the message flow in a
>> non-B2BUA session versus one that has B2BUA, perhaps I'll be able to my mind
>> around this.
>> 
>> 
>> Thanks,
>> Jeff
>> 
>> 
>> 
>> On 10/27/09 12:48 PM, "Anca Vamanu" <anca at opensips.org> wrote:
>> 
>>   
>>> Hi Jeff,
>>> 
>>> 
>>> To get pass the problems with authentication I suggest you put a check
>>> in your configuration file:
>>> 
>>> if(src_ip== proxy_ip && src_port== proxy_port)
>>>     dont_ask_authetification;
>>> 
>>> Just to let it pass without challenging it and go to the part where the
>>> Invite is forwarded to the end user.
>>> 
>>> Regards,
>>> Anca
>>> 
>>>     
> 
> 
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