[OpenSIPS-Users] B2BUA tests

[Jeff Pyle]

Anca,

Alright.  It's making more sense every moment.

I read on a post a few months ago about how either the B2BUA module or the
top-hiding scenario (can't remember which) passes only a finite number of
headers from one dialog to the other.  How might one manually pass through
specific, non-standard headers?  Is it as simple as saving them to a $var()
before b2b_init, and running insert_hf() after b2b_init?


- Jeff



On 10/30/09 6:11 AM, "Anca Vamanu" <anca at opensips.org> wrote:

> Hi Jeff,
> 
> Yes, you could surely do that also, use another server on the same
> machine ( it does not need to be a different machine but just a
> different server :) ).
> 
> Regards,
> Anca
> 
> Jeff Pyle wrote:
>> Anca,
>> 
>> Great information.  I think I'm starting to get this.
>> 
>> Let me run this scenario past you.  As I've described, I have a functional
>> proxy that forwards INVITEs upstream to a PSTN gateway.  My original
>> intention was to use the top-hiding scenario to obscure the gateway's
>> information.  Instead of using a separate server to accomplish this, is
>> there any reason I couldn't forward the PSTN-bound request to a distinct
>> domain on the same server (t_relay to the same box) where the routing
>> behavior for this domain would be to change the RURI domain to the true PSTN
>> gateway and b2b_init top-hiding?
>> 
>> 
>> Regards,
>> Jeff
>> 
>> 
>> 
>> On 10/29/09 5:02 AM, "Anca Vamanu" <anca at opensips.org> wrote:
>> 
>>   
>>> Hi Jeff,
>>> 
>>> You are right. You only need to call b2b_init function for the init
>>> request. But beware that the requests for that dialog will not get into
>>> the script anymore.
>>> You can read more details here:
>>> http://www.opensips.org/Resources/B2buaTutorial#toc17.
>>> If you are doing some other processing on the proxy, like accounting, it
>>> is advisable to move the B2BUA component on a separate server and to
>>> forward the requests to it.
>>> 
>>> Regards,
>>> Anca
>>> 
>>> Jeff Pyle wrote:
>>>     
>>>> 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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