title: Can Wifi Calling protocol be programmed into FirefoxOS?
body: <p>Using TCPdump, when connecting wifi-calling I saw DNS request to snq.t-mobilesgws.com. Then it does some ISAKMP protocol requests, TLSv1, then "ESP" protocol, according to Wireshark.</p>
  
  <p>I'm glad to see it doesn't send the IMEI in plaintext over wifi, but I'm not sure what this protocol is - could it be added to FirefoxOS/Ubuntu-touch for example? Or is this already UMA standard with many mobile OSs?</p>