As the Antenna-gate controversy raged and finally subsided, the team here was busy enhancing our App-ID technology to identify Apple’s new video calling feature – FaceTime. It is essentially the audio-video chat functionality of Apple’s iChat for desktops, but tied to the iPhone4 device. From our analysis of the network traffic of FaceTime, we discovered that it uses SIP, the industry standard protocol for VoIP telephony, STUN for NAT traversal, and XMPP over SSL for authentication with Apple.
Since it relies on Wi-Fi connectivity, corporate networks will have to carry this traffic as employees begin to use it inside the Enterprise. For enterprises that do not want to install and manage their own SIP network, it serves as an out-of-the-box mobile video calling solution.
However, some security admins are wary about the numerous ports that must be opened in their firewalls to allow FaceTime calling. …Continue reading