Because of the lack of time, and that I really don't use CentOS 6, I did not spend the time to make this available in the sixth release of CentOS. If someone needs it, I would gladly do it if sponsored.
First of all, a Call Center is a very specific use case of a FIFO queue. Any respectable call center business must have some kind of implementation for their own use or for their users.
People do not like to wait while listening to your music on hold. Depending on the nature of your business, people could switch to another business or just wait. Because of this, itis very common these days that call centers to offer a call back feature. A call center feature is the one that allows users to hang out without losing its turn in the queue. When it is their turn (or about to be their turn), the system callbacks them.
In my last article, I wrote how to use the tmpfs from Linux to speed up the local SQLite databases that FreeSWITCHtmpfsuse the tmpfs from Linux to speed up the local SQLite databases that FreeSWITCH uses for operation.
What happens when you are not using SQLite? As a cluster, Is there a way? The short answer is yes. This is more a database specific speed up, but because the nature of the use case, it is very specific for FreeSWITCH and FusionPBX.