You must ensure that the number you are calling to access US LEC's Internet servers is a local toll-free call for you. It is your responsibility to make sure that you do not access a number that would produce unwanted toll charges billed to your phone service. US LEC will not be responsible for any toll calls made to numbers that are not local to your calling area. To verify that the access number that you have selected is local, please dial 0 and tell the operator that you would like to verify that your US LEC access number is local for the number from which you will be dialing. All US LEC access numbers support the v.90 standard and are backward compatible to K56 Flex.