Any constructive thoughts on selling mobile service? My market is small offices where the owners tend to have multiline "family" type plans that are unwilling to break these plans for native SIP integration. What would work great for me is if the native SIP integration was portable and could be sold on top of an existing plan. Also, has anyone done a pros and cons of the features, service bundle, and how it compares to a SIP application like GrandStream's Wave?