Features ← Knowledge Base Can I use an Open PIN more than once? Do I need any special equipment? How do I record a conference call? How do i send an invitation to somebody I'd like to invite on to a conference call? How many people can we have on the call? How secure is your service? What if someone registers the same PIN as me? What is the difference between an 'Open call' and a 'Scheduled call'? What number should I use when outside of the UK? How do I mute an attendee? How do I listen to a recording of my call?