All trial counsel shall remain in attendance at all stages of the trial until the jury retires to deliberate, unless excused by the judge presiding. The court may permit counsel to leave, provided counsel remain in telephone contact with the court. Any counsel not present during the jury deliberation, further requests to charge, or report of the jury verdict shall be deemed to stipulate that the court may proceed in his or her absence and to waive any irregularity in proceedings taken in his or her absence.