Secure Reliable Transport – Teradek

Secure Reliable Transport has several distinct advantages:

Essentially, SRT wraps a UDP stream with the protocol to allow for more consistent streaming experience.

In Teradek Encoders, there are two connection types.

Connection Type (Listener) allows clients to initiate a connection.
Connection Type (Caller) video is sent to a destination. This enables the start-and-stop stream option.

Both modes have the following variables:

Host (Listener Disabled/Caller Enabled) - Your destination IP or domain address.
Port (Default 9710) - Port at which data is sent or pulled from. These ports must be open (outgoing or incoming) on your network for data to flow properly
Passphrase - The key that is used to encrypt your stream. Use this phrase in the decoder side as well.
Encryption key size - Allows a preset selection of key size. This variable must match at the receiving end.
Latency (Default 500) - How much delay is in the stream.

Requirements for Network in Utilizing SRT (from SRT Alliance Guide)

The SRT source device must “know” the public IP address of the firewall, and the port number on which the SRT destination device is “listening”.
The firewall must allow the specific destination port used by SRT to be accessible from the Internet.
The firewall must allow bi-directional UDP traffic.
Port forwarding must be enabled on the firewall to allow data to flow to the IP address and port of the SRT destination device.
Packet filtering must be disabled (to allow the SRT packets to pass through).