[Serusers] Failover PSTN Gateways

Ranga rrao_v at yahoo.com
Thu Sep 2 17:58:03 UTC 2004


Hey Atle/Adrian,

I guess I am lost in the discussion. I wasnt talking
about the project that Adrian was mentioning. I seem
to have overlooked.

-R
--- Ranga <rrao_v at yahoo.com> wrote:

> Atle,
> 
> We are ready with this except for short period
> thing.
> We are not thinking about solving that issue as it
> is
> a least important thing for us. Yes, we are looking
> for the feature to be added in tm module so that we
> can have configurable ring times for individual
> calls.
> 
> -Ranga
> 
> --- Atle Samuelsen <clona at camaro.no> wrote:
> 
> > Hi Ranga (and Adrian)
> > 
> > I was just qurius on when they would be finished
> > with the software.
> > Failure routes is a good thing ;-)
> > 
> > -Atle
> > 
> > * Ranga <rrao_v at yahoo.com> [040902 07:02]:
> > > 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 
> > > > > 
> > > > > 
> > > > 
> > > > >
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> > > > > serusers at lists.iptel.org
> > > > >
> > http://lists.iptel.org/mailman/listinfo/serusers
> > > > 
> > > >
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> > > >
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> > > 
> > > 
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> 
> 
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