Okla. Stat. tit. 40, § 40-2-604: Hearing

HEARING. The appeal referee to whom the appeal is assigned,

after affording the parties reasonable opportunity for a fair

hearing, shall make findings and conclusions, and on the basis

thereof affirm, modify, or reverse such determination; provided,

however, that whenever an appeal involves a question as to whether

services were performed by claimant in employment or for an

employer, or as to amount of wages reported by an employer for

claimant, the tribunal referee shall give special notice of such

issue and of the pendency of the appeal by mail to the employer and

to the Commission, both of whom shall thenceforth be parties to the

proceeding and be afforded a reasonable opportunity to adduce

evidence bearing on such questions; provided, that any party who

enters an appearance before the tribunal referee waives the

requirement of special notice by mail.