This chapter describes how to configure &TCD; to provide some Internet services through the telephone line. In this chapter, the computer holding the Internet services is named the server and the computer that want to make use of such services is named the client. We assume that both server and client computers have been installed with &TCD; (release 5.5). The dial-up connections could be a choise when the only communication medium you have access to is the telephone line system. In this configuration, both client and server computers use modems to transmit data through the telephone line in form of sound. The modem device used in this configuration was a Multi-Tech Modem (MT5634ZBA-USB) connected to an USB port.