Dell PowerConnect W-IAP175P Dell Instant 6.2.0.0-3.2.0.0 User Guide - Page 254

classify-media option enabled to identify the voice or video flow based on a deep packet inspection and analysis of the actual traffic. Microsoft OCS Microsoft Office Communications Server (OCS) uses Session Initiation Protocol (SIP) over TLS to establish, control, and terminate voice and video calls. Apple Facetime When an Apple device starts a Facetime video call, it initiates a TCP session to the Apple Facetime server over port 5223, then sends SIP signaling messages over a non-default port. When media traffic starts flowing, audio and video data are sent through that same port using RTP. (The audio and video packets are interleaved in the air, though individual the sessions can be uniquely identified using their payload type and sequence numbers.) The RTP header and payload also get encapsulated under the TURN ChannelData Messages. The Facetime call is terminated with a SIP BYE message that can be sent by either party. The following table lists the ports used by Apple Facetime. Facetime users need to be assigned a role where traffic is allowed on these ports. Table 45 - Ports Used by the Apple Facetime Application Port Packet Type 53 TCP/UDP 443 TCP 3478-3497 UDP 5223 TCP 16384-16387 UDP 16393-16402 UDP The following screenshots are configuration examples for Microsoft OCS and Apple Facetime applications. 254 | Policy Enforcement Firewall Dell PowerConnect W-Series Instant Access Point 6.2.0.0-3.2.0.0 | User Guide