13 Oct
2008
13 Oct
'08
3:24 p.m.
Daniel-Constantin Mierla schrieb:
Hello,
On 10/13/08 16:14, Klaus Darilion wrote:
should we fix the PSTN? :-)
Hi Alex!
Not sure what you mean:
For detection if the gateway responds at all use fr_timer. I set it to
2 seconds. If there is no reply from the gateway within 2 seconds, the
failure route will be executed. If there is a reply (e.g. 100), then
tm module changes to fr_inv_timer which I have set to 120 seconds.
if I get it right, might be similar to something I encountered quite
recently. There are some PSTN termination providers that frontend their
GW farm with a proxy. That proxy sends quickly 100 trying but then it
takes too long to get ringing or 200ok. So I would have needed to change to fr_inv_timer if !=
100 is received
in fr_timer.
Not changing - maybe adding a new one. The fr_timer is needed for fast
detection of GW failures.
Cheers,
Daniel
regards
klaus
Alex Balashov schrieb:
It would be really nice to have a feature in TM
for even faster
failover that is turned off when any reply is received at all,
provisional or otherwise.
The problem with fr_timer and fr_inv_timer is that they throw on lack
of final reply. But sometimes gateways have very lengthy,
complicated asynchronous operations that must complete before they
can return a final OK. If you are doing failover, the most important
thing to know is that the gateway is there at all, which the
provisional 1xx message accomplishes.
What would be really nice is to have a timer that can be diffused as
soon as a provisional reply arrives.
I don't see how this can be accomplished with any of the existing
timers.
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