I wish I could somehow have someone use an asterisk pbx and integrate it with asterisk. This way, if I click on a user, and they are available OK their soft phone installed on their mobile which connected to the asterisk pbx, I could call them. If they are already on their computer, I believe the latest version of mattermost would allow me to speak to them via chrome (webrtc). However, it would be nice to integrate an open source pbx with mattermost.