[OpenSIPS-Devel] Proposal: new timer in dialog module

[Bogdan-Andrei Iancu]

Hi Federico,

you can achieve the same by using the standard dialog timeout - when the 
dialog is created, you set a dialog timeout to reflect the timeout for 
ACK . When the ACK is received, you can set a new dialog timeout to 
reflect the dialog lifetime (as established).

All these you can do from script, using the dialog_timeout avp.

Regards,

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


On 12/10/2012 01:05 PM, Federico Cabiddu wrote:
> Hi all,
> recently I had the need to be able to terminate a call if the ACK to 
> the 200 OK of an INVITE was not received after a short time. Since I 
> was using the dialog module the natural place where to implement such 
> kind of timer seemed to be the dialog module. So I added to the module 
> two new parameters:
>
> - default_ack_timeout (integer): default to 0
> - ack_timeout_avp (string)
>
> The behavior is the following:
>
> - upon the reception of the 200 OK, if default_ack_timeout is > 0 or 
> if the ack_timeout_avp is set, the timer is armed
> - if the ACK message arrives before the timeout is reached, the dialog 
> lifetime is restored to the value set by default_timeout or timeout_avp
> - if the ACK message doesn't arrive before the timeout is reached, the 
> dialog is deleted (closed with BYE if the B flag was used in the 
> dialog creation)
>
> I admit that this goes against rfc 3261, but for our current case (in 
> which we cannot wait for the retransmission timeout of the callee) it 
> works. If you think that it's a feature it's worth having I can 
> provide the patch I'm currently using.
>
> Best regards,
>
> Federico Cabiddu
>
>
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