Ill. Admin. Code tit. 47, § 700.209 – Quorum and Voting

a) A majority of the Directors then holding such office shall constitute a quorum for the transaction of any business. Directors may participate in any meeting through the use of a conference telephone or similar communications equipment by means of which all persons participating can hear each other, and such participation in a meeting shall constitute presence in person at the meeting. At any meeting of the Board of Directors, if there is less than a quorum present, a majority of those present may adjourn the meeting from time to time until a quorum is obtained.
b) When a quorum is present at any meeting of the Board of Directors, the vote of a majority of the voting Directors then holding such office shall be the act of the Board and shall decide any question properly brought before such meeting. Each voting Director shall have one vote in all such decisions.