[Kamailio-Users] newbie question

[Alex Balashov]

Hi Luis,

The short, basic answer is: nothing. The proxy does not intrinsically  
know about dialog state, only transaction state.  The result is rather  
the same as if you were running a stateless proxy.  Thus, any in- 
dialog requests arising subsequently to the restart will continue to  
be properly routed on the basis of their To tag, their Route header,  
etc.  Of course, if any dialogs are tracked with the 'dialog' module,  
they will be forgotten -- even if you are using a db_mode that implies  
100% synchronized database backing, because there is still a great  
deal of dialog information held in runtime memory.  So, if you are  
using 'dialog' profiles with values to, for example, enforce  
concurrent call limits, those counters will be 0 after restart.

Aside from that, the only other thing I can think of that would be of  
significance happens at the transactional level, not the dialog  
level.  Replies are statefully routed to the orginator of a request by  
TM using in-memory state information that is lost during a reboot.   
Thus, for example, if you have a dialog whose establishment is in  
progress (180 or 183, for instance), and at that point you restart  
Kamailio, then a subsequent 200 OK is generated, it will not be  
properly relayed back to the near-end endpoint.  There are other ways  
to statelessly route a reply, but the point is if you are using TM  
then you are not using those ways, but taking advantage of stateful  
proxy's transactional memory.

To sum up: a reboot won't break things *too* badly - certainly, no  
existing calls will drop or fail to be hung up properly later - but is  
generally undesirable.

--
Sent from mobile device

On Oct 25, 2009, at 10:36 AM, Luis Jimenez <ljjimenez at gmail.com> wrote:

> Hello, list.
>
> Exactly what happens with a dialog (at accounting level) when i  
> reload kamailio with dialogs in process?
>
> Thanks in advance.
> Luis Jimenez
>
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