Yes, we can; but only within 30 days of its expiration date. For example, if your voucher expires on November 2 you can request an extension from October 2 until November 1. Upon our approval of your extension request, your voucher will be extended for 6 months. 

Voucher extensions can only be granted once, so you will have to schedule and take the exam within the newly extended 6-month period - before the new expiration date. Upon expiration, the voucher can no longer be extended or used, and the value is forfeited.