Zoom Phone conference call allows three or more participants to join the same phone call simultaneously. Participants can be added to a conference via an extension, a phone number, a search in the contact list, or by merging a call that is on hold. By default the main company caller ID is used when generating a conference call, however the initiator can decide the caller ID to be used.
Zoom Phone conference call has the following limitations:
Zoom Phone Basic users can conference up to 3 participants.
Zoom Phone Pro users can conference up to 10 participants.
An emergency phone call can conference up to 10 participants.
A delegate who is located in a different SIP Zone than the delegator (for instance the delegate is in the UK and the delegator is in the USA), cannot share hosting privileges with the delegator.
A conference call cannot be end-to-end encrypted if any of the participants did not join from the Zoom app.