The outages could have been caused by the DSL or Cable providers service not working. Vontage is at their mercy for service. Steady connection means steady VOIP.
The hassle in switching back phone numbers: is IF a person wants their land line phone number back with the telephone company. Or to switch their land line number over to the Vontage or VOIP provider.
A form has to be signed by the customer in order for Vontage or other VOIP company to get a land line number. and the same goes for the Telephone company, if a customer wants them back and their phone number being used by the VOIP provider. It is a mandated process and has strict guidelines for both companies. Also a voice verification recording the customer voice that they are aware of the change, with some companies needs to be done and kept on file.
It's not as easy as flipping a switch like most customers think
The best thing to do is ...IF Vontage can just give you a number within your area code GREAT...take it If you really don't need to worry about having your old phone number and can just get the new number in use for family and friends and business your deal with. Do that.
I strongly recommend that you do not disconnect your land line though until you are up and running with the VOIP. just to make sure you are not without phone service.
If you want some experiment time with Vongtage or other VOIP service ...check on reserving your phone number with the telephone company:
OR ask the telephone company how you can get your old number back before it's recycled for use. Some companies it's 90 days some companies 6 months and some 9 months to a year. This is from the date of disconnection.
This way..if you decide the VOIP service is not for you, you can get that number you had with the phone company. Howver keep in mind, you will have to pay your reconnection fees just as you would for new service with the phone company.
Hope that helps!