It would seem the best solution is to use something that can use the SIP protocol for
making routing decisions - for example, Kamailio acting as a stateless load balancer,
either as a replacement for your load balancer or between your layer4 load balancer (just
doing pure round-robin of received packets) and your stateful SIP endpoint. A simple
deterministic algorithm (like modulo over a hash of the called) will ensure that a CANCEL
will reach the same stateful SIP endpoint as the INVITE.
-----Original Message-----
From: Alex Balashov via sr-users <sr-users(a)lists.kamailio.org>
Sent: Tuesday, October 10, 2023 12:31 PM
To: Kamailio (SER) - Users Mailing List <sr-users(a)lists.kamailio.org>
Cc: Alex Balashov <abalashov(a)evaristesys.com>
Subject: [SR-Users] Re: Using DMQ to sync the TM module.
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But I should add: do you actually need state? All replies can be routed back based on the
content of SIP headers alone -- that is to say, statelessly. Most simple load balancers
remain stateless for this very reason.
On 10 Oct 2023, at 13:09, Alex Balashov
<abalashov(a)evaristesys.com> wrote:
There is not.
On 10 Oct 2023, at 12:50, Michel Pelletier via
sr-users <sr-users(a)lists.kamailio.org> wrote:
Hi,
I have 2 kamailio instances behind a load balancer. The problem I have is that the load
balancer can only track TCP connections, but not UDP. So one Kamailio instance might send
a request using UDP, while the corresponding UDP reply arrives on the other. This
doesn't play well with the (stateful) TM module. Is there a way to synchronize the TM
module accross Kamailio instances using DMQ?
Cheers,
Michel Pelletier
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Alex Balashov
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Alex Balashov
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Web:
https://evaristesys.com/
Tel: +1-706-510-6800
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