Common use of NAT/Firewall Traversal Clause in Contracts

NAT/Firewall Traversal. The first challenge to the establishment of the media channel is the traversal of any NAT/Firewalls that may exist between the two media processing entities (endpoints or MCUs). To help with the NAT/Firewall traversal TIP mandates the use of symmetric RTP/RTCP ports [6]. A TIP-complian device MUST transmit all packets in a symmetric fashion, i.e., that the IP address and UDP port of a transmitted packet exactly match the IP address and UDP port for reception of the corresponding media stream. However, when receiving packets from the remote peer, implementations SHOULD accept packets with a UDP source port that differs from the destination UDP port that is being used when transmitting.

NAT/Firewall Traversal. The first challenge to the establishment of the media channel is the traversal of any NAT/Firewalls that may exist between the two media processing entities (endpoints or MCUs). To help with the NAT/Firewall traversal TIP mandates manadtes the use of symmetric RTP/RTCP ports [6]. A TIP-complian device MUST transmit all packets in a symmetric fashion, i.e., that the IP address and UDP port of a transmitted packet exactly match the IP address and UDP port for reception of the corresponding media stream. However, when receiving packets from the remote peer, implementations SHOULD accept packets with a UDP source port that differs from the destination UDP port that is being used when transmitting.

NAT/Firewall Traversal. The first challenge to the establishment of the media channel is the traversal of any NAT/Firewalls that may exist between the two media processing entities (endpoints or MCUs). To help with the NAT/Firewall traversal TIP mandates requires the use of symmetric RTP/RTCP ports [6]. A TIP-complian TIP device MUST transmit all packets in a symmetric fashion, i.e., that the IP address and UDP port of a transmitted packet exactly match the IP address and UDP port for reception of the corresponding media stream. However, when receiving packets from the remote peer, implementations SHOULD accept packets with a UDP source port that differs from the destination UDP port that is being used when transmitting.