# Using msppsamp

Run msppsamp to test data transmission between two Fusion gateway systems. msppsamp uses the MSPP service to process and encode/decode voice and fax data while transferring data between PSTN and IP networks.

msppsamp performs the following tasks:

- Creates the maximum supported number of MSPP connections between endpoints on the IP network and the PSTN interfaces.

- Responds to incoming calls from the PSTN and enables MSPP connections.

- Provides a mechanism for controlling and querying the filters that make up MSPP connections.

- Initializes and loads the CG board (using oamsys) when invoked through the sample command file demo.cmd.

### msppsamp illustration

msppsamp requires two computers equipped with CG boards and connected over an IP network. Each system must include Fusion software and test equipment to place and receive calls (and, if necessary, transmit and receive fax data). The following illustration shows an overview of an msppsamp test environment:

For more information, refer to Fusion nailed-up sample: msppsamp.