# ThroughPacket (TPKT) endpoints

ThroughPacket is a proprietary multiplexing algorithm for grouping together payloads from multiple voice streams directed to the same destination (for example, a remote gateway). ThroughPacket (TPKT) endpoints provide a mechanism by which gateways systems group voice data payloads from separate voice channels into larger packets. ThroughPacket headers contain any information the receiving gateway needs to de-multiplex the packets and send the de-multiplexed payloads to their appropriate destinations.

Each TPKT packet carries the combined payloads of several separate voice sessions, yet contains only a single header. Therefore, the application sends fewer total packets, while devoting a smaller portion of its data output to transferring header information. The following illustration shows a Fusion gateway using the ThroughPacket multiplexing method to send payloads from multiple sessions in common packets:

ThroughPacket's enhanced efficiency in transferring data reduces the total bandwidth the application needs to transfer voice data across the network. By multiplexing many streams of RTP data, a VoIP system employing ThroughPacket technology is able to provide two major benefits:

- Reduced data rate

- Reduced packet rate