Incoming call does not show multiple. It only shows the first one it receives. A default service would be ok for some, but the problem I have is slow internet at home. I would have to disable the default because my upload speed and latency is too slow to support VOIP. When I am at work, SIP is prefered because of an open firewall. When I am on a public network, Skype seems to do the best through a firewall. A possible solution would be for the client to poll the server and measure a virtual signal strength and then decide which one to use. I don't know what that would do battery life. Use GPS to decide?