And jaxtr is not just about hearing from people who visit a user's profile or blog. By adding their jaxtr link to their email signature, global friends can call our users on their phone with the click of the mouse - without downloading any software, incurring international phone charges or even registering for jaxtr.
When users change their work, home or mobile number, they simply add or update their number on jaxtr; incoming calls then get routed to the phone of their choice. They can even block callers from reaching them or specify on a per-caller basis which callers can reach them live and which get routed to voice mail. Isn't that sweet? )