On 09/28/2010 11:04 PM, Brad Knowles wrote:
Facetime on the iPhone is the most trivially simple piece of software to configure -- Apple has already done all the hard work for you.
You are probably right, but an Apple-only solution won't cut it in the real world. I wish you were right about your claims of FaceTime being a completely open protocol. I am skeptical.
According to this article, it appears that FaceTime is entirely dependent on Apple's proprietary push service (which appears to be a proprietary implementation of XMPP,) instead of the XMPP-JINGLE open standard, for invoking the SIP session.
http://www.packetstan.com/2010/07/special-look-face-time-part-1.html " Based on this analysis we can determine several critical pieces of how Facetime works: * Unknown TCP protocol starts the conversation, likely initiated following an event that starts on the GSM network; * Unknown UDP traffic between two hosts with similar IP addresses; * Certificate validation through an Akamai server, followed by an HTTPS request to an Apple server; * STUN traffic for NAT traversal; * SIP traffic for call setup and negotiation; * UDP stream data for video/audio. "FaceTime may indeed be "more open" than Skype. But if it cannot exist without Apple, it is not actually open.
Jesse
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