# Implementing ThroughPacket multiplexing

Fusion applications can use MSPP service ThroughPacket (TPKT) endpoints to reduce the total bandwidth needed to transfer multiple sessions of data to a common destination over a packet network. The following illustration shows a Fusion gateway using MSPP service TPKT endpoints to multiplex the payloads from several voice channels into larger packets:

When Fusion endpoints at the destination gateway receive TPKT packets, they de-multiplex the data and direct the individual payloads to their separate destinations.

To implement TPKT endpoints on a Fusion system, you must:

1. Configure TPKT parameters in the CG board's keyword file (using the OAM configuration parameters) and boot the board.

2. Create and configure TPKT endpoints with MSPP service functions.

Applications can create MSPP TPKT endpoints in one of two modes.

Mode | Description
Complex | TPKT transport where payloads from different sessions are combined into larger packets to reduce the number of packets transferred to the network.
Simple | TPKT transport where separate media sessions are carried in separate packets. This type of transport supports proprietary Clarent systems and does not reduce the bandwidth required by the application. Use RTP transport for individual VIP sessions.