[OpenSIPS-Users] B2BUA tests

Jeff Pyle jpyle at fidelityvoice.com
Tue Oct 27 18:18:25 CET 2009 

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
> 
> 
> Jeff Pyle wrote:
>> Hi Anca,
>> 
>> Thanks for the info.  Yes, I've seen that doc.  It seemed rather
>> straight-forward to implement a the top-hiding scenario in an already
>> functioning proxy.
>> 
>> But that wasn't how it turned out.  In my case, I do have a functioning
>> proxy config.  It could benefit from the top-hiding scenario's capabilities.
>> I configured the module, and put b2b_init_request("top hiding") on the
>> initial invite.  I couldn't get past a 407 Proxy Auth Required message it
>> seemed to send.  I don't know why.  There were some other signaling
>> anomalies as well.  See below.
>> 
>> This first packet is the initial invite.  Not sure why tshark decodes it as
>> a fragment.
>> 
>>   0.000000 UAC_IP -> PROXY_IP  IP Fragmented IP protocol (proto=UDP 0x11,
>> off=0)
>>   0.006640  PROXY_IP -> UAC_IP SIP Status: 407 Proxy Authentication Required
>>   0.060155 UAC_IP -> PROXY_IP  SIP Request: ACK sip:2162222222 at osproxy.com
>> 
>> Initial auth challenge completed, repeat with auth:
>> 
>>   0.068099 UAC_IP -> PROXY_IP  IP Fragmented IP protocol (proto=UDP 0x11,
>> off=0)
>>   0.079454  PROXY_IP -> UAC_IP SIP Status: 100 Trying
>> 
>> At this point without the b2bua init proxy would send the call to the pstn
>> gateway.  But, with it, there's a 407:
>> 
>>   0.132225  PROXY_IP -> UAC_IP SIP Status: 407 Proxy Authentication Required
>> 
>> Then it t_relay's to the pstn gateway:
>> 
>>   0.174369  PROXY_IP -> GATEWAY_IP  SIP/SDP Request: INVITE
>> sip:2162222222 at pstngateway.com:5060, with session description
>>   0.177125  GATEWAY_IP -> PROXY_IP  SIP Status: 100 Trying
>> 
>> The UAC ACKs the 407 and as far as it knows the call is dead:
>> 
>>   0.185117 UAC_IP -> PROXY_IP  SIP Request: ACK sip:2162222222 at osproxy.com
>> 
>> But the call continues...
>> 
>>   0.334048  GATEWAY_IP -> PROXY_IP  SIP Status: 100 Giving a try
>>   0.657848  PROXY_IP -> UAC_IP SIP Status: 407 Proxy Authentication Required
>>   1.046243  GATEWAY_IP -> PROXY_IP  SIP/SDP Status: 183 Session Progress,
>> with session description
>>   1.657868  PROXY_IP -> UAC_IP SIP Status: 407 Proxy Authentication Required
>>   4.088186  GATEWAY_IP -> PROXY_IP  SIP/SDP Status: 200 OK, with session
>> description
>>   4.093551  PROXY_IP -> UAC_IP SIP/SDP Status: 200 OK, with session
>> description
>>   5.085704  GATEWAY_IP -> PROXY_IP  SIP/SDP Status: 200 OK, with session
>> description
>>   5.087303  PROXY_IP -> UAC_IP SIP/SDP Status: 200 OK, with session
>> description
>>   6.086620  GATEWAY_IP -> PROXY_IP  SIP/SDP Status: 200 OK, with session
>> description
>>   6.088207  PROXY_IP -> UAC_IP SIP/SDP Status: 200 OK, with session
>> description
>>   8.086146  GATEWAY_IP -> PROXY_IP  SIP/SDP Status: 200 OK, with session
>> description
>>   8.086526  PROXY_IP -> UAC_IP SIP/SDP Status: 200 OK, with session
>> description
>> 
>> 
>> So something is not right here.  What would cause the b2bua module to send a
>> 407?
>> 
>> 
>> - Jeff
>> 
>> 
>> On 10/27/09 5:47 AM, "Anca Vamanu" <anca at opensips.org> wrote:
>> 
>>   
>>> Hi Jeff,
>>> 
>>> There is not much things that you need to know to configure B2BUA for
>>> topology hiding.
>>> As it is written in the documentation
>>> also(http://www.opensips.org/Resources/B2buaTutorial#toc5):
>>> To achieve topology hiding, "the B2BUA poses itself in the middle and
>>> established dialogs with both parties. Then all it will do next will be
>>> to translate a receipt request or reply into the dialog from the other
>>> side and forward it to the peer entity".
>>> 
>>> So you just need to trace the messages and see that the b2b server sends
>>> all the messages from one side to the other side and that the
>>> destination is correctly set.
>>> If you see something wrong or you can not investigate it by yourself you
>>> can send me an e-mail with the trace.
>>> Also a good thing is to monitor the log file and see if there are any
>>> errors.
>>> 
>>> As for the configuration file the example from the documentation applies
>>> to topology hiding also, you just have to change the parameter of the
>>> b2b_init_request to "top hiding":
>>> http://www.opensips.org/Resources/B2bConfigExample.
>>> 
>>> 
>>> Regards,
>>> Anca
>>> 
>>> Jeff Pyle wrote:
>>>     
>>>> Ancu,
>>>> 
>>>> I've been trying to test the 'top hiding' scenario included with the module
>>>> for a while now.  It fails every time I do.  I haven't seen any
>>>> documentation on to implement it correctly.
>>>> 
>>>> If there's something I'm missing, can you point me in the right direction?
>>>> 
>>>> I'd love to post some debugs but I'm not sure it's supposed to work,
>>>> therefore I'm not sure if I'm on the right track.
>>>> 
>>>> Perhaps a "standard" implementation of 'top hiding' will help Daniel in his
>>>> situation as well.
>>>> 
>>>> 
>>>> - Jeff
>>>> 
>>>> 
>>>> 
>>>> On 10/26/09 1:09 PM, "Anca Vamanu" <anca at opensips.org> wrote:
>>>> 
>>>>   
>>>>       
>>>>> Hi Daniel,
>>>>> 
>>>>> You tested B2BUA with the scenarios from the documentation and they did
>>>>> not work?
>>>>> If this is so, you can post here a trace.
>>>>> 
>>>>> B2BUA in OpenSIPS does work.
>>>>> 
>>>>> Regards,
>>>>> Anca
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> Daniel Cardoso Alves wrote:
>>>>>     
>>>>>         
>>>>>> Hi...
>>>>>> 
>>>>>> I was making some tests with b2bua modules, but I thought the
>>>>>> documentation very
>>>>>> confuse.
>>>>>> 
>>>>>> I know that the B2Bua module is alpha.
>>>>>> 
>>>>>> I make few tests, but it like work rigth. I use the examples in
>>>>>> http://www.opensips.org/Resources/B2buaTutorial#toc1, and I tried
>>>>>> modify some thinks and doesnt work.
>>>>>> 
>>>>>> In the function b2b_init_request I can pass a AVP (or other thing not
>>>>>> static) as a param?
>>>>>> 
>>>>>> Is possible make a Functional B2BUA with OpenSIPs?
>>>>>> 
>>>>>> 
>>>>>> Thanks...
>>>>>> 
>>>>>> 
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