Re: [OpenSIPS-Users] Problem with simultaneous CANCEL + 200 OK

[Daniel Zanutti]

Hi Bogdan

I could reproduce the problem on lab. This is the scenario:

A INVITE -> OPENSIPS
OPENSIPS INVITE -> B

OPENSIPS <- B 200 OK

A <- 200 OK OPENSIPS
This 200 OK is lost or discarded on A, not sure if was on network or
problem at client. Then:

A CANCEL -> OPENSIPS
A <- 200 OK (of Cancel) OPENSIPS

Then the call is up for ever.

Here is the log at the moment the CANCEL is received:
https://pastebin.com/79qanD2H

And PCAP:
https://drive.google.com/file/d/1lpHWN1uRD1SOwBTZdijSodXBWhUX-rM8/view?usp=sharing

Can you help?

Thanks





On Thu, Feb 22, 2018 at 1:24 PM, Bogdan-Andrei Iancu 
wrote:

> Daniel,
>
> The pcap shows only one leg of the the communication (I guess caller
> versus OpenSIPS). So I cannot see what happens on the callee side. Still, I
> see the first cancel is rejected with 400 (I guess by OpenSIPS - check the
> logs to see the reason) and the second one is accepted by OpenSIPS (no idea
> if relayed to callee or not). Still, if there is a race between the cancel
> from caller and the answer from callee, it is up to the caller to sort it
> outaccording to RFC, the caller must ACK the received 200 OK (even if
> CANCEL was sent) and if it really wants to terminate the call, it has to
> fire a BYE.
>
> Regards,
>
> Bogdan-Andrei Iancu
>
> OpenSIPS Founder and Developer
>   http://www.opensips-solutions.com
> OpenSIPS Summit 2018
>   http://www.opensips.org/events/Summit-2018Amsterdam
>
> On 02/22/2018 04:22 PM, Daniel Zanutti wrote:
>
> Hi Bogdan
>
> Thanks for replying.
>
> Here is the PCAP, please take a look: https://drive.google.
> com/file/d/1e7SKjxDtdVYmN-7fCHSEqNEsNHjPsaKo/view?usp=sharing
>
> Thanks
>
> On Thu, Feb 22, 2018 at 7:30 AM, Bogdan-Andrei Iancu 
> wrote:
>
>> Hi Daniel,
>>
>> Without a pcap showing the signaling is hard to understand (not to
>> mention helping) your scenario. Please provide a link to the pcap or ngrep.
>>
>> Regards,
>>
>> Bogdan-Andrei Iancu
>>
>> OpenSIPS Founder and Developer
>>   http://www.opensips-solutions.com
>> OpenSIPS Summit 2018
>>   http://www.opensips.org/events/Summit-2018Amsterdam
>>
>> On 02/20/2018 06:43 PM, Daniel Zanutti wrote:
>>
>> Hey
>>
>> I had a problem when receiving simultaneous CANCEL from customer and 200
>> OK from gateway.
>>
>> Seems that the first CANCEL was rejected, but the second CANCEL was
>> accepted. This second CANCEL did NOT go to the gateway, just Opensips
>> received and replied with 200 OK.
>>
>> This is the log of the first CANCEL:
>> Feb 15 18:39:22 /sbin/opensips[28845]: SCRIPT:TRAFFIC:WARNING: method
>> CANCEL ( 7Qbq3O3CReMfPflAtl8NY3ddTqPVBHO2785126@2.2.2.2/ XAeG2xj278512T2
>> / 1839212581509953 ) not validated and not fixed ( code=-1 )
>>
>> code -1 is the return of validate_dialog()
>>
>> Second CANCEL didn't generated a log.
>>
>> Shouldn't all CANCELs be rejected? On this case, just the first one was
>> rejected.
>>
>> I'm using version 1.9.11.
>>
>>
>>
>>
>> ___
>> Users mailing 
>> listUsers@lists.opensips.orghttp://lists.opensips.org/cgi-bin/mailman/listinfo/users
>>
>>
>>
>
>
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Re: [OpenSIPS-Users] Problem with simultaneous CANCEL + 200 OK

[Bogdan-Andrei Iancu]

Daniel,

The pcap shows only one leg of the the communication (I guess caller 
versus OpenSIPS). So I cannot see what happens on the callee side. 
Still, I see the first cancel is rejected with 400 (I guess by OpenSIPS 
- check the logs to see the reason) and the second one is accepted by 
OpenSIPS (no idea if relayed to callee or not). Still, if there is a 
race between the cancel from caller and the answer from callee, it is up 
to the caller to sort it outaccording to RFC, the caller must ACK 
the received 200 OK (even if CANCEL was sent) and if it really wants to 
terminate the call, it has to fire a BYE.


Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
  http://www.opensips-solutions.com
OpenSIPS Summit 2018
  http://www.opensips.org/events/Summit-2018Amsterdam

On 02/22/2018 04:22 PM, Daniel Zanutti wrote:

Hi Bogdan

Thanks for replying.

Here is the PCAP, please take a look: 
https://drive.google.com/file/d/1e7SKjxDtdVYmN-7fCHSEqNEsNHjPsaKo/view?usp=sharing


Thanks

On Thu, Feb 22, 2018 at 7:30 AM, Bogdan-Andrei Iancu 
> wrote:


Hi Daniel,

Without a pcap showing the signaling is hard to understand (not to
mention helping) your scenario. Please provide a link to the pcap
or ngrep.

Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
   http://www.opensips-solutions.com 
OpenSIPS Summit 2018
   http://www.opensips.org/events/Summit-2018Amsterdam


On 02/20/2018 06:43 PM, Daniel Zanutti wrote:

Hey

I had a problem when receiving simultaneous CANCEL from customer
and 200 OK from gateway.

Seems that the first CANCEL was rejected, but the second CANCEL
was accepted. This second CANCEL did NOT go to the gateway, just
Opensips received and replied with 200 OK.

This is the log of the first CANCEL:
Feb 15 18:39:22 /sbin/opensips[28845]: SCRIPT:TRAFFIC:WARNING:
method CANCEL (7Qbq3O3CReMfPflAtl8NY3ddTqPVBHO2785126@2.2.2.2/
XAeG2xj278512T2
/ 1839212581509953 ) not validated and not fixed ( code=-1 )

code -1 is the return of validate_dialog()

Second CANCEL didn't generated a log.

Shouldn't all CANCELs be rejected? On this case, just the first
one was rejected.

I'm using version 1.9.11.




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Re: [OpenSIPS-Users] Problem with simultaneous CANCEL + 200 OK

[Daniel Zanutti]

Hi Bogdan

Thanks for replying.

Here is the PCAP, please take a look:
https://drive.google.com/file/d/1e7SKjxDtdVYmN-7fCHSEqNEsNHjPsaKo/view?usp=sharing

Thanks

On Thu, Feb 22, 2018 at 7:30 AM, Bogdan-Andrei Iancu 
wrote:

> Hi Daniel,
>
> Without a pcap showing the signaling is hard to understand (not to mention
> helping) your scenario. Please provide a link to the pcap or ngrep.
>
> Regards,
>
> Bogdan-Andrei Iancu
>
> OpenSIPS Founder and Developer
>   http://www.opensips-solutions.com
> OpenSIPS Summit 2018
>   http://www.opensips.org/events/Summit-2018Amsterdam
>
> On 02/20/2018 06:43 PM, Daniel Zanutti wrote:
>
> Hey
>
> I had a problem when receiving simultaneous CANCEL from customer and 200
> OK from gateway.
>
> Seems that the first CANCEL was rejected, but the second CANCEL was
> accepted. This second CANCEL did NOT go to the gateway, just Opensips
> received and replied with 200 OK.
>
> This is the log of the first CANCEL:
> Feb 15 18:39:22 /sbin/opensips[28845]: SCRIPT:TRAFFIC:WARNING: method
> CANCEL ( 7Qbq3O3CReMfPflAtl8NY3ddTqPVBHO2785126@2.2.2.2/ XAeG2xj278512T2
> / 1839212581509953 ) not validated and not fixed ( code=-1 )
>
> code -1 is the return of validate_dialog()
>
> Second CANCEL didn't generated a log.
>
> Shouldn't all CANCELs be rejected? On this case, just the first one was
> rejected.
>
> I'm using version 1.9.11.
>
>
>
>
> ___
> Users mailing 
> listUsers@lists.opensips.orghttp://lists.opensips.org/cgi-bin/mailman/listinfo/users
>
>
>
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Re: [OpenSIPS-Users] Problem with simultaneous CANCEL + 200 OK

[Bogdan-Andrei Iancu]

Hi Daniel,

Without a pcap showing the signaling is hard to understand (not to 
mention helping) your scenario. Please provide a link to the pcap or ngrep.


Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
  http://www.opensips-solutions.com
OpenSIPS Summit 2018
  http://www.opensips.org/events/Summit-2018Amsterdam

On 02/20/2018 06:43 PM, Daniel Zanutti wrote:

Hey

I had a problem when receiving simultaneous CANCEL from customer and 
200 OK from gateway.


Seems that the first CANCEL was rejected, but the second CANCEL was 
accepted. This second CANCEL did NOT go to the gateway, just Opensips 
received and replied with 200 OK.


This is the log of the first CANCEL:
Feb 15 18:39:22 /sbin/opensips[28845]: SCRIPT:TRAFFIC:WARNING: method 
CANCEL (7Qbq3O3CReMfPflAtl8NY3ddTqPVBHO2785126@2.2.2.2/ 
XAeG2xj278512T2 
/ 1839212581509953 ) not validated and not fixed ( code=-1 )


code -1 is the return of validate_dialog()

Second CANCEL didn't generated a log.

Shouldn't all CANCELs be rejected? On this case, just the first one 
was rejected.


I'm using version 1.9.11.




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Users mailing list
Users@lists.opensips.org
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