Okla. Admin. Code § 590:10-1-16
An original document containing a member's, joint annuitant's or beneficiary's signature is generally required on all System forms, applications or requests for confidential information except as provided herein or in 590:10-1-3. Retirement notice forms, beneficiary designation forms, Step-Up election forms , and any form which requires a notarized signature, must always be provided as original signed documents. Electronic signatures may be accepted if the System provides for means of electronic submission with an electronic signature. At the sole discretion of the System, a facsimile copy of certain types of other documents may be accepted if the copies are clear, legible and sufficient for imaging purposes. In some instances, these other documents may be accepted by facsimile only if followed by later delivery of an original document. The decision to accept facsimile copies shall be made on a case-by-case basis upon request of the member, joint annuitant or beneficiary. It is the member, joint annuitant or beneficiary's responsibility to verify that the System has received the facsimile copy and that it is legible and acceptable to the System. This rule is applicable to any plan or account managed or administered by the Board.
Okla. Admin. Code § 590:10-1-16