The number of simultaneous sessions depends on the plan. Currently, the developer plan offers 1 simultaneous session, the Basic plan offers 50 simultaneous sessions and the Enterprise plan offers unlimited simultaneous sessions.
In case you exceed the number of simultaneous sessions, callstats.io will receive the data from the exceeded sessions and you will be able to access it. The system will however note that there was an increase in usage, and send an email if there is a sustained increase.
If the volume increase is expected to remain, we suggest upgrading your account.