[OpenSIPS-Users] OpenSIPS 2.2 changes CSeq numbers after SIP OPTIONS received. Is it a bug?

[Bogdan-Andrei Iancu]

Hi Rodrigo,

That OPTIONS (even if it is really weird to have that OPTIONS inserted 
between 200OK and ACK) should not affect the cseq numbering in ACK as it 
is in opposite direction.

If you manage to get rid of that OPTION, is the ACK cseq correct ?

With this bogus scenario, can you run in log_level 4 (debug) and post 
the opensips logs (covering the whole call) for inspection ?

Best regards,

Bogdan-Andrei Iancu
   OpenSIPS Founder and Developer
   http://www.opensips-solutions.com

OpenSIPS Bootcamp 2017, Houston, US
   http://opensips.org/training/OpenSIPS_Bootcamp_2017.html

On 06/26/2017 03:18 PM, Rodrigo Pimenta Carvalho wrote:
>
> Dear OpenSIPS users,
>
> I'm facing a problem related to CSeq numbers in SIP messages and maybe 
> it is being caused by SIP OPTIONS messages.
> When a caller sends a SIP ACK to the callee, the SIP ACK has CSeq = 2. 
> However, after being relayed by OpenSIPS, the CSeq number become 3.
> It seems that OpenSIPS decided to change such value on its own. But, 
> maybe it was caused by the previous SIP OPTIONS message receive before.
> The diagram bellow shows what is happening.
>
> Can the SIP OPTIONS message cause such issue? If yes, should I give up 
> of using SIP OPTIONS? Can it be a bug in OpenSIPS?
> If not, what is happening here??
> If that CSeq remains like 3, the callee will simply discard the SIP 
> ACK and send another SIP OK, will not discard?
>
>
>
> Caller OpenSIPs                          Callee
> | |                                        |
> | |                                        |
> |       INVITE |                                        |
> |       CSeq = 2 |                                        |
> |------------------------------->| INVITE                    |
> |                                         |        CSeq = 
> 2                |
> | |------------------------------->|
> | |                                         |
> |                                         | TRYING                 |
> |                                         |         CSeq = 
> 2               |
> |      TRYING |<-------------------------------|
> |      CSeq = 2                  |                    |
> |<-------------------------------|      |
> | |                                        |
> |                                          | RING                     |
> |                                          | CSeq = 2               |
> |      RING |<-------------------------------|
> |      CSeq = 2 |                                          |
> |<-------------------------------|       |
> |                                         |         SIP 
> OK                   |
> |                                         |         CSeq = 
> 2               |
> |      SIP OK |<-------------------------------|
> |      CSeq = 2 |                                         |
> |<-------------------------------|       |
> |                                         |         SIP 
> OK                   |
> |                                         |         CSeq = 
> 2               |
> |      SIP OK |<-------------------------------|
> |      CSeq = 2 |                                         |
> |<-------------------------------|       |
> | |                                        |
> |                                         |        SIP OPTIONS       |
> |                                         |        CSeq = 
> 3                |        <<---- new CSeq
> | |<-------------------------------|
> | |                                         |
> |                                         |         SIP 
> 500                  |
> |                                         |         CSeq = 
> 3               |
> | |------------------------------->|
> |       ACK |                                        |
> |       CSeq = 2 |                                         |
> |------------------------------->| ACK                        |
> |                                         |        CSeq = 
> 3                |      <<---- Cseq of ACK was changed by OpenSIPS.
> | |------------------------------->|
> |       ACK |                                          |
> |       CSeq = 2 |                                         |
> |------------------------------->| ACK                        |
> |                                         |        CSeq = 
> 3                |
> | |------------------------------->|
> | |                                         |
> |                                         |         SIP 
> OK                   |
> |                                         |         CSeq = 
> 2               |
> |      SIP OK |<-------------------------------|
> |      CSeq = 2 |                                         |
> |<-------------------------------|       |
> |       ACK |                                         |
> |       CSeq = 2 |                                         |
> |------------------------------->| ACK                        |
> |                                         |        CSeq = 
> 3                |
> | |------------------------------->|
> | |                                         |
> |                                         |         SIP 
> OK                   |
> |                                         |         CSeq = 
> 2               |
> | |<-------------------------------|    <<------- This SIP OK never 
> receives a SIP ACK with CSeq = 2...and the problem continues.
>
> Any hint will be very helpful!!
> Best regards!
>
>
> RODRIGO PIMENTA CARVALHO
> Inatel Competence Center
> Software
> Ph: +55 35 3471 9200 RAMAL 979
>
>
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> Users mailing list
> Users at lists.opensips.org
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