We recently had an "all-employee" conference call by the CEO and it caused an "all trunks busy" condition for 3 of our locations. We are not using SIP Trunking and each location is trunked based on typical usage. A communications is sent to staff to either attend the meeting in person or to call a conference number. Although employees are encouraged to go to a conference room with others for the call, the issue is that we have too many people that stay at their desk and then call into the conference and take a trunk for the duration of the call. Are there any ways to get multiple users to call into a single connection without each tying up a trunk ? We are an Avaya IP shop, CM 5.2.1