[reSIProcate] application timer in resiprocate architecture

[Byron Campen]

	Please note, any files I mention are referring to svn head.

Answers inlined:

> Hi,
>
> I have few questions regarding the AppTimerQueue in reSIProcate  
> architecture.
>
> 1. How this AppTimerQueue is initialized for timers for each of the  
> TUs? It is
> connected with the SIP Stack Obj box in the arch. diag.
>

	In svn head, there is only one queue of app timers (see resip/stack/ 
TimerQueue.hxx for the definition of TuSelectorTimerQueue); stuff  
coming out of this queue is de-multiplexed based on the  
TransactionUser* contained in the message (see resip/stack/ 
Message.hxx), and passed to the appropriate TU's fifo.

> 2. What is the significance of SIP Stack Obj block in the  
> architecture design
> as it looks like referring to the SIP stack only (as the name  
> suggests). So I
> want to know what exact functionality it is supposed for.
>

	The SIP Stack Obj in the architecture design diagram refers to a  
instance of the SipStack class. It is effectively intended as an  
abstraction-layer on top of stuff like TransactionController/ 
TransactionState, TransportSelector and the TUSelector. Its secondary  
duty is to coordinate all the pieces of the system in their processing.
	
> 3. What can be the scenarios where I would need to tell the  
> application about
> the timeouts. Only one that I can think of is that on UAS side,  
> receiving a
> request if the TU does not provision within 200ms then the  
> transaction layer
> can send a provisional response to the peer. Here it will be good  
> to send a
> timeout to the App.

	The stack automatically sends a provisional if the TU does not in  
200ms (by default). No prompting of the TU is necessary. The  
AppTimerQueue is intended to allow the TU to set up arbitrary timers  
for anything under the sun. For example, repro uses this mechanism to  
schedule call-processing events (ie, if this target doesn't answer in  
3 sec, move on to this other target; see repro/ForkControlMessage.hxx).

>
> Thanks,
>
> Regards,
> Nilay
> _______________________________________________
> resiprocate-devel mailing list
> resiprocate-devel at list.sipfoundry.org
> https://list.sipfoundry.org/mailman/listinfo/resiprocate-devel

Best regards,
Byron Campen


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