We've used vonage for a few years. Never any problems until recently. We have several phone #'s and we were getting people telling us they had been trying to contact us for weeks and were getting a busy signal. After a few people were telling us this, we did some testing and it was only calls coming from a hand full of #'s. One of these customers actually got us through another # and we did testing with him on the phone. He dialed our main # and it was busy for him. We called from our cell phones and no problems. We had my Wife's Mother call and no problem. We confronted Vonage about this and found out we had a whole hodgepodge of things wrong with out account. Other people's #'s coming to our #, 800 # that was de-activated a couple years ago still partially live. We switched to Packet 8, what a joke. Anyway, we switched to ATT VOIP. Jury is still out and this is our last stop on the VOIP train. Although VOIP saves us hundreds of $$ per montho on phone bills, in the Disaster Restoration business, it's not worth the gamble. If you are an owner operator or have only 2 numbers, then it's a great way to go. The savings are large. Maybe one day a company will come out with a VOIP service developed specifically for the business customer......and it ain't packet 8.