The SIM calls licenses are spread out over the customers you configure and as you grow your multi-tenant system, you upgrade your license just like a normal installation.
For more information please refer to our blog post.
@AndreasMi_3CX the blog does not discuss allocation of the channels per department.
If the license is 64 Sim.Channels and we have 4 departments but each department has different number of users and different number of SIP trunks ... is there a way to allocate number of sim.channels per department? or 64 channels gets spread across all departments and if that is the case if the first department takes over all 64 channels it means none will remain for second department, which will be no fair share, as in next instance it may be other way round ...
There is no channel allotment per department, you will have to buy big enough license to cater for all the users on the system depending on their usage.
Yes it works exactly the same as a large 3CX system, when the channels are full the next caller will get the license exceeded message. So you need to plan for your maximum use.