The answer depends on the audio conferencing service you are using.
Reservationless (On Demand) Audio Conferencing
You can have a maximum of 150 connections on any given reservationless audio conferencing call. Keep in mind some of these connections on your call might be a phone from a boardroom and there may be more than one person in that boardroom. Therefore, to maximize the number of PEOPLE you can have on a reservationless audio conferencing call, try to encourage as many people into a boardroom as you deem comfortable and try to have as many boardroom connections as possible (rather than having everyone calling from their person or workstation phone). Just a friendly suggestion to maximize the participation turnout on these calls.
If you need more than 150 ports on your call, we can very likely accommodate your request but we will need advance notice and it would be a one-time adjustment.