There is no registration involved and each party pays their own costs to join the call, making this probably the most cost effective way to conduct remote meetings. We like to think of it as a virtual worldwide meeting place where colleagues can discuss business, conduct meetings and do what comes naturally to humans... talk
Chose any 6 digit number (the last 6 digits of your phone number is fine).
Tell them the PIN, and tell them to dial 0871 22 61 505 when you want the conference call to start.