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I might be interested in sponsoring someone to develop this, as I've had
several customers ask for it (must be a lot of venture capital flooding
into VOIP :-).
Although technicaly I have no idea how it would be done...
As a work around , wouldn't a high persistence on UDP by source ip work
OK ? (allbeit with badly balanced load.)
Erik Versaevel wrote:
Hello,
I'm currently trying to create a loadbalacing SIP (voip protocol)
cluster, however for this to work I need SIP messages from the same
call (identifiable by the sip callid field) to get to the same
realserver over and over again. (so, I need persistence based on the
contents of the SIP Call-ID field). This would call for ktcpvs as we
need to process packets at layer 7, however that poses 2 new problems,
the first is that SIP uses clear text UDP messages, not tcp and the
second is that there are no SIP modules for ktcpvs.
Another option would be to mark SIP packets with iptables/netfilter
based on the callid, however i run into the same problem, there are no
modules to accomplish this.
I know that there are commercial products available who are able to do
SIP session persistence based on callid, the F5 Big-IP for example,
the downside of that is it costs around $ 10.000 for a single
loadbalancer (which is a SPOF so you need 2) and is a bit overkill as
i don't need multi gigabit loadbalancing.
Any thoughts on this?
Kind regards,
E. Versaevel
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Loadbalancer.org Limited
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