Well my SIP client app manages the loss of Wi-Fi or mobile connectivity pretty well - I loose audio for a second while it renegotiates the path through the othe

Well my SIP client app manages the loss of Wi-Fi or mobile connectivity pretty well - I loose audio for a second while it renegotiates the path through the other network link but after that it's business as usual. On a conventional call when I loose cell coverage the call is dropped, so SIP is a winner for me. On the server side you can do amazing things with high availability like floating/virtual IPs (the IP of the SIP server is actually shared between multiple machines, and if the primary machine goes down the secondary takes over its IP and as far as the client is concerned nothing happened).