Ex parte communications prohibited by § 102.126 shall not include:
(a) Oral or written communications which relate solely to matters which the hearing officer, regional director, administrative law judge, or member of the Board is authorized by law or Board rules to entertain or dispose of on an ex parte basis.
(b) Oral or written requests for information solely with respect to the status of a proceeding.
(c) Oral or written communications which all the parties to the proceeding agree, or which the responsible official formally rules, may be made on an ex parte basis.
(d) Oral or written communications proposing settlement or an agreement for disposition of any or all issues in the proceeding.
(e) Oral or written communications which concern matters of general significance to the field of labor-management relations or administrative practice and which are not specifically related to pending on-the-record proceedings.