(e) If the medical witness for the claimant does not appear for cross-examination as scheduled, then an extension of time to take testimony shall be granted only where the Worker’s Compensation Law Judge finds that the witness could not have appeared within that period because of good cause, and that the party seeking the extension acted in good faith and with due diligence. If the extension is granted, the testimony shall be taken by deposition at the earliest date practicable but not more than thirty days after the date the witness was originally scheduled to testify. Such deposition may be taken by telephone. The insurance carrier is solely responsible for enforcing a subpoena to compel the appearance of the witness at the deposition. In the event that the insurance carrier fails to enforce a subpoena to compel appearance of the witness at the deposition, the report of the witness shall remain in evidence.