VoIP Vonage or better?

I have two Vonage lines that consistently go offline average once per day. Calls to our friends in India never permanently solve the problem. Does anyone know of a company like Vonage we could use for our VoIP? Other than the recycling problem, it's been a great service. Better pricing than landline. We did go back to a landline for our fax line, since we had to slow down faxing over Vonage to 1980's Compuserve speeds. Thanks!