We are rolling out an integrated, free conference call platform with FireRTC. Though it is still a beta-feature, it is open to all users immediately.
To host a conference call, simply type in 'conference' into the dialer. You will hear an announcement and then be prompted to enter a PIN. Choose a PIN for the call, and you are good to go. If others want to dial in from FireRTC, they can dial 'conference' and enter your secret PIN that you have set up.
If they want to use a regular phone, the dial-in number is 1-641-715-3363.