On Wed, 2008-10-22 at 16:29 -0600, Farr, Steven C. wrote:
> What we've seen when doing the two PRI gateways as two separate
> unmanaged gateways is that if the first one in the list goes down, often
> the first couple of calls attempted don't work but it does seem to
> figure out what to do after that. Does sipX mark the gateway as "dead"
> and ignore it for a while? Or does it still try it for each and every
> outbound call? I guess most of my failover testing has been with failing
> the PSTN, as opposed to taking the actual gateway offline, which is to
> say that the AudioCodes gateway was still there to say "nope, sorry the
> PRI is down" as opposed to getting no response at all...

The answer depends on exactly how sipX is configured to pair the two
gateways.  I suspect that in your case, the call is forked to each
gateway.  In that case, if an attempt to use the first gateway returns a
failure response, sipX will try the second gateway.  Most likely, sipX
is trying the first gateway every time, but the gateway responds so
quickly the caller doesn't notice a delay.

Dale


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