[Serusers] Failover PSTN Gateways

Ranga rrao_v at yahoo.com
Thu Sep 2 05:10:40 UTC 2004


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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> > > >
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> > > 
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> > > 
> > 
> > 
> > 
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