yep, setup a reedundant kamailio or opensips loadbalancer  in active-passive

http://www.opentelecom.it/cluecon/ClueCon_2015_Load_Balancing_HA.pdf

On Wed, Nov 25, 2015 at 10:10 PM, Oivvio Polite <mylists@polite.se> wrote:
Hello!

Is is possible to set up a machine in front of a pair of FreeSwitch
servers and have it control which of the two servers is currently
responsible for handling traffic. The point of this, of course being
that it would minimize downtime during server repair or upgrades.

Martin Fowler describes this pattern in general terms here:
http://martinfowler.com/bliki/BlueGreenDeployment.html

Regards,  Oivvio Polite


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