Apple’s facetime protocol

The Technology Behind Apple’s FaceTime Protocol

Facetime Facetime is a 2-way video chat service for iPhone 4, iPod touch, iPad 2 and OSX Mac client. Wi-Fi only support. Closed services built on Open Standards.

Facetime Call Call initiation requires no ‘registration’. Facetime registers phone numbers to the phones via apple proprietary methods (non-sip, fully encrypted) Call start using Apple Push Notification Server. SIP used for negotiation and call setup, HTTP and TLS for authentication. RTP and H264&AAC used for media streaming.

H264 -Most common video standard today AVC (advanced video coding) SVC (scalable video coding)

AAC - Advanced Audio Coding standard Widely used today in audio and video communications, has established interoperability. Commonly used by Apple’s devices.

SIP ,[object Object],de-facto standard of IP Communications solutions +Voice and video Used by majority of video conferencing vendors: Cisco, Tandberg, Polycom, RADVISION and more. One of the core standards in 3GPP IMS

STUN, TURN and ICE ,[object Object],STUN- allows to map internal IP addressed behind the NAT to the external IP addresses TURN- used in rare cases where STUN doesn’t provide a solution ICE- umbrella standard utilizing STUN, TURN, uPnP in order to find ways to transfer the NAT and Firewall.

RTP ,[object Object],Voice and Video over IP implementations carrying over real-time media and collecting of the statistics Jitter+latency, which allows to implement better quality solutions. Used by absolute majority IP voice and video vendors.

SRTP ,[object Object],profile for secure RTP communication Encryption Message authentication Integrity Used in both IP Video and Voice implementations

Apple’s facetime protocol

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Apple’s facetime protocol