[OpenSIPS-Users] Accounting: How to avoid a fraudulent BYE with lower CSeq?

[Bogdan-Andrei Iancu]

Hi Inaki,

Iñaki Baz Castillo wrote:
> 2009/1/13 Bogdan-Andrei Iancu <bogdan at voice-system.ro>:
>   
>> HI Inaki,
>>
>> well, it could be a way to prevent it. For BYEs, the path is pre-determined
>> (via Route headers), so the dialog module could check if the path from the
>> current BYE is the same as the path stored in dialog module by the INVITE -
>> more or less if the BYE will follow the same path as the INVITE.
>>
>> Just an idea....
>>     
>
> It seems really interesting. Just a question please:
>
> I've tryed the following scenario:
>
>    alice at domain_A --UDP--> proxy_A --UDP--> Proxy_B --TCP--> bob at domain_B
>
> Dialog module shows the following route set for the caller:
>
> caller_route_set::
> <sip:proxy_A_IP;transport=tcp;r2=on;lr=on;did=2bf.1ed4b0a5>,<sip:proxy_A_IP;r2=on;lr=on;did=2bf.1ed4b0a5>
>
> How would be matched this route set? as string comparission? (I hope no)
> Would important parameters as "transport" be matched?
>   
I would suggest (as first attempt) to check the IP, port and proto....

Regards,
Bogdan