What does the maximumNumberOfEndpoints field in the scheduleRendezvousMeeting control?
 
According to the documentation:
 
At attend time, the system does not limit the actual number of endpoints that can join the meeting to this value. As long as the reserved capacity is available, more endpoints can join if the endpoints have fewer screens than the "worst-case" scenario accounted for in the capacity calculation.

Is this value used to calculate the number of ports/segments for the meeting? If so, can this value be set to zero and the additionalCapacity be used to specify the exact number of ports/segments for the rendezvous meeting?
 
If the allowedHostEndpoints are specified, are those endpoints used in determining the number of ports/segments for the rendezvous meeting?