Thanks Alex & Olle!

I've done some tests with Keepalived for Virtual IP failover, and I found that it works more or less as you mentioned, Olle: if an Invite comes from Server #1, and that server gets offline, the BYE will indeed be correctly processed by Server #2.

Isn't DMQ supposed to handle this? as i understand, DMQ sends the SIP messages to other servers, so wouldn't it be enough? (I assume, I haven't tested DMQ yet.... )

Sérgio Charrua

www.voip.pt
Tel.: +351 91 631 11 44

Email : sergio.charrua@voip.pt

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On Tue, Feb 27, 2024 at 2:20 PM Olle E. Johansson via sr-users <sr-users@lists.kamailio.org> wrote:

In theory if you set the record-route to a DNS name and not an Ip address, then endpoints should be able to failover within a dialog - but as Alex says - transactions may fail. In many cases there are retry timers to restart transactions that fail.

This means that if a call starts with an INVITE transaction on one server, it should in theory be able to find another server for the BYE. Whether this DNS srv based fail over is implemented in end-points is up to testing to prove. If not, then virtual IP failover is your best friend.

/O

> On 27 Feb 2024, at 13:33, Alex Balashov via sr-users <sr-users@lists.kamailio.org> wrote:
>
> That would require transaction replication, which Kamailio doesn't have.
>
> Most messages can be processed statelessly, so this isn't a huge obstacle. However, CANCELs won't work.
>
>> On 27 Feb 2024, at 06:49, Sergio Charrua via sr-users <sr-users@lists.kamailio.org> wrote:
>>
>> Hi all!
>>
>> I am having some difficulties/doubts on what would be the best approach to let multiple Kamailio servers share their SIP sessions between each other.
>> The goal is to have HA on Kamailio cluster such that if a call is received and initiated on Kamailio #1, and during any moment of the call (before or while established) if the server #1 goes down or Kamailio stops working for any reason, the call can be processed by Kamailio server #n available in the cluster.
>> I do not want to mess with Virtual IPs or DNS, that is not the point, but instead need to get a proper way to share SIP sessions between Kamailio servers such that any server could continue the call without issue.
>>
>> I have checked the Dialog and DMQ module, but I am not sure if that is the way to go....
>>
>> Could any one share a solution for this?
>>
>> Greatly appreciated.
>>
>> Cheers,
>>
>>
>> Sérgio Charrua
>> www.voip.pt
>>
>>
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