[SR-Users] Best practise for limiting concurrent calls across a cluster

[jay binks]

Hey all,

So I have a cluster of Kamailio servers ( 4 servers currently, soon to be 8
),
I'm looking for suggestions about the BEST way to achieve concurrent call
limiting on a per customer basis, across the whole cluster.

Initially I mis-read the dialog module documentation and assumed that
dialog would provide me this ability, when used with a database.  however
it seems that the dialog module does not pull data from the DB after the
initial startup.

I know I can use sql ops to increment and decrement using
event_route[dialog:start] and event_route[dialog:end]. however the database
I've chosen ( for other valid reasons ) does not have an atomic increment
and decrement.   I could add yet another DB, but that just adds more
failure points.

so lets forget my setup,  Im wanting suggestions about the BEST setup for
this sort of thing.   while remaining fault tolerant, and preferably
without relying on any single point of failure.


Sincerely

Jay
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