First; I have used many VOIP carriers over the years with little to no issues. Now; to the issues at hand: there are certain numbers VOIPo will not dial regardless of whether it's through the BYOD or their ATA. I tried dialing an 804.305.xxxx; goes to dead air. Dial the same number on a different carrier, non VOIPo SIP provider, call goes through with no issues. Dialed the same number on a cell, call goes through with no issues. Second issue; their BYOD server is questionable at best. Their BYOD server seems to be intermittent on a regular basis. I do realize their BYOD is not supported however why offer a service which is intermittent at best. Some of the issues I have encountered with their BYOD; intermittent call audio (one call is fine while another call - cannot hear the called number or vice versa); intermittent inbound calls coming through, intermittent outbound calls and the dreaded service not available to register with. I am considering cancelling this service and requesting a refund of my full four year prepayment.