If the parameter sourceAddressFiltering is enabled, the filters incoming media packets, which do not match the expected source IP address and UDP port. In the Lync desktop sharing, the accepts incoming TCP connection that matches any of the source addresses in the candidate lines of the ICE SDP received from the peer. When the has not received an SDP from the peer, before the peer attempts to establish the TCP connection, the ignores source address filtering and allows the TCP connection to be established on the application sharing stream. |