[Serusers] Failover PSTN Gateways

Ranga rrao_v at yahoo.com
Thu Sep 2 07:02:54 CEST 2004


Adrian/Atle,

We did this using failure routes. Only problem was,
wait time ( invite timer ) for both gateways is same
as we cant have two timers with different timeout
values in ser.

See inline comments.

-Ranga

--- Atle Samuelsen <clona at camaro.no> wrote:

> Howdy Adrian!
> 
>  Do you know when you whing you'll be finnish with
> this project? or
>  atleast ready for use?
> 
> 
>  -atle
> 
> * Adrian Georgescu <ag at ag-projects.com> [040902
> 00:42]:
> > There is some work in progress: 
> > 
> > http://download.dns-hosting.info/SERLCR/README 
> > 
> > Adrian 
> > 
> > >>>>>>>> 
> > Hi list, 
> > 
> > We have a setup with 2 redundant stateful SER
> SIP-Servers with 
> > accounting. 
> > 
> > For calls to the PSTN we have 2 ISDN-PRI gateways
> connected to 
> > different ISDN-PRI lines. 
> > 
> > We need to implement a dynamic failover mechanism
> and load balancing. 
> > 
> > a) Incoming calls: No problem, the PSTN switch
> takes care of that 
> > b) Outgoing calls: 
> >   Both GWs are registered at both SERs; calls are
> usually relayed with 
> > "t_relay_to_udp(x.x.x.x, "5060");" 
> >   But how can I implement a quick failover
> including load-distribution 
> > between those gatways? 

Load distribution may require a seperate module/exec
script to take routing decisions. When acc is enabled
you can query database for active calls. We can
quickly check which gateway is handling how many calls
and change the host portion of URI before t_relay. 

> >   I.e. if I receive "busy here" or no response
> after a short period 
> > after the "invite", the call should be redirected
> to the other GW. 
Busy here can be easily handled in failure route.
Having short duration for first call and little longer
timeout for next call is not possible at the moment, I
guess.

> > 
> > Thanks in advance for your help! 
> > 
> > Best regards, 
> > Gerhard 
> > 
> > 
> 
> > _______________________________________________
> > Serusers mailing list
> > serusers at lists.iptel.org
> > http://lists.iptel.org/mailman/listinfo/serusers
> 
> _______________________________________________
> Serusers mailing list
> serusers at lists.iptel.org
> http://lists.iptel.org/mailman/listinfo/serusers
> 



		
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