First things first. You need to sign up to the conferencing call service to get access to get access to dial-in numbers and a unique PIN. You can have an unlimited number of callers and have access to 16 international shared cost (everyone pays for their own call) numbers.
Everyone likes an invite, right? Makes them feel special. When scheduling a conferencing call, send a calendar invite so you aren’t alone wondering how everyone forgot the meeting you’ve been planning for days.