Voice over Internet Protocol (VoIP) telephony marries an enterprise's telephone system to its SOHO LAN. Marrying a Private Branch Exchange (PBX) to a SOHO LAN is not really a home office application because how many homes besides mine have their own PBX? However, there are low-end VoIP components for the home-office LAN that can be used to reduce long distance costs by providing free PC-to-PC VoIP connections and home-office LAN to Public Switched Telephone Network (PSTN) connections. Typically, a special telephony server or gate keeper is needed to provide the translation from the internal SOHO IP network to the dialup operation of the PSTN. See Figure 1.14.