Is there a way to start multiple sub conference calls in an on going conference of large number of callers.

For example: There a conference going on between 20 callers, then some point in time, a conference between 3-4 callers spawns based on some condition so that what they discuss is not audible to rest of the caller and on termination of the condition these 3-4 people rejoins the original conference.

Regards,

Deepika