Ill. Admin. Code tit. 2, § 1520.100
Except in cases of emergency, a member of the Commission must be physically present at the time and place of the meeting to be considered in attendance at a given meeting. In emergency situations members may attend by telephone or video conference so long as at least 3 of the members are physically present and if the persons seeking to attend by telephone or video make arrangements to do so with the Chair in advance.