Meetings of the board of directors, regular or special, or any committee designated thereby, may be held either within or without this state. Regular meetings of the board of directors or any committee designated thereby may be held with or without notice as prescribed in the bylaws. Special meetings of the board of directors or any committee designated thereby shall be held upon the notice prescribed in the bylaws. Attendance of a director at a meeting constitutes a waiver of notice of the meeting, except where a director attends a meeting for the express purpose of objecting to the transaction of any business because the meeting is not lawfully called or convened. Neither the business to be transacted at, nor the purpose of, any regular or special meeting of the board of directors or any committee designated thereby need be specified in the notice or waiver of notice of the meeting unless required by the bylaws. Except as otherwise restricted by the articles of incorporation or bylaws, members of the board of directors or any committee designated thereby may participate in a meeting of the board or committee by means of a conference telephone or similar communications equipment by means of which all persons participating in the meeting can hear each other at the same time and participation by such means shall constitute presence in person at a meeting.