For all purposes of this Agreement (except as otherwise expressly provided in this Agreement with respect to notice periods), all communications, including without limitation, notices, consents, requests or approvals, required or permitted to be given hereunder will be in writing, and will be deemed to have been duly given when hand delivered or dispatched by electronic facsimile transmission (with receipt thereof orally confirmed), or ten business days after having been mailed by United States registered or certified mail , return receipt requested, postage prepaid, or five business days after having been sent by a nationally recognized overnight courier service such as Federal Express or UPS, addressed to the Company (for the GENBAND Parties) at 2801 Network Boulevard, Suite 300, Frisco, Texas 75034 (to the attention of the General Counsel of the Company) and to the Executive at the Company's address, with a copy to the Executive at his principal residence, or to such other address as any party may have furnished to the other in writing and in accordance herewith, except that notices of changes of address shall be effective only upon receipt.