The question you are asking is a loaded one. Below are some general guidelines but will very greatly depending on call flow, rings groups, additional plugins/modules, encoding, conference rooms used, etc…
512MB of Memory: 5-15 Simultaneous calls
1GB of Memory: 15-25 Simultaneous calls
2Gb of Memory: 25-50 Simultaneous calls
You might see more or less simultaneous calls depending on your specific configuration.
We can also upgrade your VPS as needed with a simple reboot.
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