Update
Since my last report there has been a very noticeable problem in calls. There is a whooshing sound when there is a pause in a conversation. It gradually increases until either party either speaks or there is audio detected. Called Vonage support and I have even connected the Vonage adaptor directly to my cable modem but no resolution found. It's a pity as I thought it was all working so well. Anyone else had a similar problem and if so did you find a resolution?