[OpenSIPS-Devel] Messages out of order?

[Bogdan-Andrei Iancu]

Hi Chris,

Chris Maciejewski wrote:
> Hi,
>
> Just noticed that sometimes OpenSIPs forwards SIP packets out of order.
>
> Please see example call flow at:
> http://wima.co.uk/sip/2009-04-21_15-01-10-c2c-123_index.html
>
> Packets F11 and F12 from "Click2Call" are forwarded in the wrong order
> to "UA1".
>
> Is it a bug?
it is not a bug - packages may change order because:
    1) UDP (there is no guarantee of the order)
    2) processing - as opensips is a parallel processing proxy, some 
packages may be processed slower than others (depending of the nature of 
the request)
>  Or maybe it is some problem with my call flow?
>
> Please note: Packets from Click2Call are generated by
> "PHP SIP library" I coded myself, so quite likely they are no good.
>   
well, the REFER is sent at .0002 secs after the ACK - you should give 
more time to ACK before firing the REFER. This will eliminate the risk 
of order inversion .

Regards,
Bogdan
> Any help/suggestions much appreciated.
>
> Regards,
>
> Chris
>
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