Thanks ramy. I need to tell my sister that. She switched to Vonage last year and since, I can never reach her. Everytime the local cable company loses internet for them her phone is unreachable. IT happens way too often. In some areas, VOIP is just a terrible option due to the BB internet reliability.
Personally, I would never use it. Instead I shut off my landline in January with ATT and switched the number to my cell phone. My cell service is as reliable as a landline here and I don't miss the landline one bit.
This year we have had 5 outages of cable modem service and it was back on in a few hours. However, if I had the cable phone service I would have had no phone during that time and would need the cell phone anyway. If I do need a special phone service beyond what the cell can do, I have used skype which worked well.